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Attenuation coefficient

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1758: 1347: 1984:, or "dB", where 10 dB represents attenuation by a factor of 10. The units for attenuation coefficient are thus dB/m (or, in general, dB per unit distance). Note that in logarithmic units such as dB, the attenuation is a linear function of distance, rather than exponential. This has the advantage that the result of multiple attenuation layers can be found by simply adding up the dB loss for each individual passage. However, if intensity is desired, the logarithms must be converted back into linear units by using an exponential: 1753:{\displaystyle {\begin{aligned}\mu &=\mu _{\mathrm {a} }+\mu _{\mathrm {s} },\\\mu _{\nu }&=\mu _{\mathrm {a} ,\nu }+\mu _{\mathrm {s} ,\nu },\\\mu _{\lambda }&=\mu _{\mathrm {a} ,\lambda }+\mu _{\mathrm {s} ,\lambda },\\\mu _{\Omega }&=\mu _{\mathrm {a} ,\Omega }+\mu _{\mathrm {s} ,\Omega },\\\mu _{\Omega ,\nu }&=\mu _{\mathrm {a} ,\Omega ,\nu }+\mu _{\mathrm {s} ,\Omega ,\nu },\\\mu _{\Omega ,\lambda }&=\mu _{\mathrm {a} ,\Omega ,\lambda }+\mu _{\mathrm {s} ,\Omega ,\lambda }.\end{aligned}}} 1254: 1020: 2686: 1249:{\displaystyle {\begin{aligned}\mu _{\Omega ,\nu }&=-{\frac {1}{L_{\mathrm {e} ,\Omega ,\nu }}}{\frac {\mathrm {d} L_{\mathrm {e} ,\Omega ,\nu }}{\mathrm {d} z}},\\\mu _{\Omega ,\lambda }&=-{\frac {1}{L_{\mathrm {e} ,\Omega ,\lambda }}}{\frac {\mathrm {d} L_{\mathrm {e} ,\Omega ,\lambda }}{\mathrm {d} z}},\end{aligned}}} 1763:
Just looking at the narrow beam itself, the two processes cannot be distinguished. However, if a detector is set up to measure beam leaving in different directions, or conversely using a non-narrow beam, one can measure how much of the lost radiant flux was scattered, and how much was absorbed.
243:. The attenuation coefficient is dependent upon the type of material and the energy of the radiation. Generally, for electromagnetic radiation, the higher the energy of the incident photons and the less dense the material in question, the lower the corresponding attenuation coefficient will be. 819: 2419: 1939: 1775:
loss of narrow-beam intensity, including scattering as well. "Narrow-beam attenuation coefficient" always unambiguously refers to the latter. The attenuation coefficient is at least as large as the absorption coefficient; they are equal in the idealized case of no scattering.
968: 718: 346: 2282: 2847: 2133:-fold reductions that occur over a unit length of material, this coefficient measures how many 10-fold reductions occur: a decadic coefficient of 1 m means 1 m of material reduces the radiation once by a factor of 10. 1313:. Absorption indicates energy that is lost from the beam, while scattering indicates light that is redirected in a (random) direction, and hence is no longer in the beam, but still present, resulting in diffuse light. 724: 2681:{\displaystyle {\begin{aligned}\mu (z)&=\sum _{i=1}^{N}\mu _{i}(z)=\sum _{i=1}^{N}\sigma _{i}n_{i}(z),\\\mu _{10}(z)&=\sum _{i=1}^{N}\mu _{10,i}(z)=\sum _{i=1}^{N}\varepsilon _{i}c_{i}(z),\end{aligned}}} 481: 1847: 873: 58:. A coefficient value that is large represents a beam becoming 'attenuated' as it passes through a given medium, while a small value represents that the medium had little effect on loss. The (derived) 623: 2381: 2933:(HVL) is the thickness of a layer of material required to reduce the radiant flux of the transmitted radiation to half its incident magnitude. The half-value layer is about 69% (ln 2) of the 2910: 2424: 1352: 1025: 2124: 4058:
Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients from 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest
270: 3799: 2161: 2048: 516: 565: 4062: 3866: 2976: 93:
one meter) thickness of material, so that an attenuation coefficient of 1 m means that after passing through 1 metre, the radiation will be reduced by a factor of
3987: 585: 536: 415: 395: 2781: 3749: 1306: 814:{\displaystyle \mu _{\lambda }=-{\frac {1}{\Phi _{\mathrm {e} ,\lambda }}}{\frac {\mathrm {d} \Phi _{\mathrm {e} ,\lambda }}{\mathrm {d} z}},} 4028: 3908: 2937:. Engineers use these equations predict how much shielding thickness is required to attenuate radiation to acceptable or regulatory limits. 423: 1804:. Assuming that dz is so small that there will be no overlap of the cross section areas, the total area available for absorption will be 1934:{\displaystyle {\frac {\mu }{\rho _{m}}},\quad {\frac {\mu _{\mathrm {a} }}{\rho _{m}}},\quad {\frac {\mu _{\mathrm {s} }}{\rho _{m}}},} 963:{\displaystyle \mu _{\Omega }=-{\frac {1}{L_{\mathrm {e} ,\Omega }}}{\frac {\mathrm {d} L_{\mathrm {e} ,\Omega }}{\mathrm {d} z}},} 713:{\displaystyle \mu _{\nu }=-{\frac {1}{\Phi _{\mathrm {e} ,\nu }}}{\frac {\mathrm {d} \Phi _{\mathrm {e} ,\nu }}{\mathrm {d} z}},} 2962: 3928: 1296: 2318: 2969: 2858: 2742: 1767:
In this context, the "absorption coefficient" measures how quickly the beam would lose radiant flux due to the absorption
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The (Napierian) attenuation coefficient and the decadic attenuation coefficient of a material sample are related to the
1824: 125: 2147:
rather than just simply "attenuation coefficient". The terms "decadic" and "Napierian" come from the base used for the
2078: 195: 341:{\displaystyle \mu =-{\frac {1}{\Phi _{\mathrm {e} }}}{\frac {\mathrm {d} \Phi _{\mathrm {e} }}{\mathrm {d} z}},} 95: 3754: 2277:{\displaystyle T=e^{-\int _{0}^{\ell }\mu (z)\mathrm {d} z}=10^{-\int _{0}^{\ell }\mu _{10}(z)\mathrm {d} z},} 3804: 2945: 2704: 1987: 489: 4052: 1341:
The attenuation coefficient of a volume is the sum of absorption coefficient and scattering coefficients:
541: 177: 3779: 2152: 3829: 3764: 2761: 2406: 2148: 20: 119:
counts forward-scattered radiation as transmitted rather than attenuated, and is more applicable to
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For "attenuation coefficient" as it applies to electromagnetic theory and telecommunications, see
4108: 3814: 3794: 3774: 3303:, divided by the spectral radiance incident onto that surface. This should not be confused with " 4020: 4057: 4024: 3904: 3839: 2934: 2923: 1977: 1784:
The absorption coefficient may be expressed in terms of a number density of absorbing centers
79: 141:
of a beam is reduced as it passes through a specific material. It is used in the context of:
4076: 4008: 3880: 3834: 2930: 1302: 240: 210: 63: 3809: 163: 89:
distance of the original intensity as the energy of the intensity passes through a unit (
4047: 3253:, divided by the radiance incident onto that surface. This should not be confused with " 4013: 3980:"Thermal insulation — Heat transfer by radiation — Physical quantities and definitions" 3824: 3784: 2941: 2723: 2402: 570: 521: 400: 380: 3924: 235:
A small attenuation coefficient indicates that the material in question is relatively
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Dukhin, A.S. and Goetz, P.J. "Ultrasound for characterizing colloids", Elsevier, 2002
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The attenuation coefficient is called the "extinction coefficient" in the context of
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ISO 20998-1:2006 "Measurement and characterization of particles by acoustic methods"
3876: 3789: 1954: 1305:) beam passes through a volume, the beam will lose intensity due to two processes: 844: 833: 360: 138: 4084:
Error in template * unknown parameter name (GoldBookRef): "access-date"
3888:
Error in template * unknown parameter name (GoldBookRef): "access-date"
4067: 3871: 3769: 3405: 3374: 3338: 3312: 3262: 3227: 3187: 3157: 75: 71: 2842:{\displaystyle \varepsilon _{i}={\frac {N_{\text{A}}}{\ln {10}}}\,\sigma _{i},} 3304: 3254: 3219: 3218:, divided by that received by that surface. This should not be confused with " 3179: 3178:, divided by that received by that surface. This should not be confused with " 3107: 3072: 3036: 3010: 2772:
by definition of attenuation cross section and molar attenuation coefficient.
1310: 218: 4071:, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) " 3875:, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) " 38:
characterizes how easily a volume of material can be penetrated by a beam of
4080: 3884: 2155:
for a material sample, in which the two attenuation coefficients take part:
191: 149: 83: 2775:
Attenuation cross section and molar attenuation coefficient are related by
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is the attenuation coefficient normalized by the density of the material.
99:, and for material with a coefficient of 2 m, it will be reduced twice by 1283: 1270: 981: 214: 47: 221:, albeit usually denoted with another symbol (given the standard use of 170:(although actually it is not a section dimensionally speaking), denoted 1981: 1971: 185: 159: 55: 51: 2304:
is the path length of the beam of light through the material sample.
476:{\displaystyle \Phi _{\mathrm {e} }=\Phi _{\mathrm {e0} }e^{-\mu z}} 373:
Note that for an attenuation coefficient which does not vary with
145: 43: 39: 2129:
Just as the usual attenuation coefficient measures the number of
137:
The attenuation coefficient describes the extent to which the
4048:
Absorption Coefficients α of Building Materials and Finishes
601:
spectral hemispherical attenuation coefficient in wavelength
1338:, are defined the same way as the attenuation coefficient. 597:
spectral hemispherical attenuation coefficient in frequency
3737:
per unit length, divided by that received by that volume.
3687:
per unit length, divided by that received by that volume.
3652:
per unit length, divided by that received by that volume.
3612:
per unit length, divided by that received by that volume.
2944:. Moreover, it is very closely related to the attenuation 1976:
Engineering applications often express attenuation in the
998:
spectral directional attenuation coefficient in wavelength
1819:
Mass attenuation, absorption, and scattering coefficients
994:
spectral directional attenuation coefficient in frequency
4053:
Sound Absorption Coefficients for Some Common Materials
3800:
Computation of radiowave attenuation in the atmosphere
2376:{\displaystyle T=e^{-\mu \ell }=10^{-\mu _{10}\ell }.} 3899:
Serway, Raymond; Moses, Clement; Moyer, Curt (2005).
2940:
Attenuation coefficient is also inversely related to
2861: 2784: 2422: 2321: 2164: 2081: 1990: 1850: 1800:, the total number of absorbing centers contained is 1350: 1023: 876: 727: 626: 573: 544: 524: 492: 426: 403: 383: 273: 2905:{\displaystyle c_{i}={\frac {n_{i}}{N_{\text{A}}}},} 239:, while a larger value indicates greater degrees of 4012: 2904: 2841: 2680: 2375: 2276: 2118: 2042: 1933: 1752: 1248: 962: 813: 712: 579: 559: 530: 510: 475: 409: 389: 340: 2119:{\displaystyle \mu _{10}={\frac {\mu }{\ln 10}}.} 107:. Other measures may use a different factor than 70:is another term for this quantity, often used in 1780:Expression in terms of density and cross section 3974: 3972: 3970: 3968: 3966: 3964: 3962: 2852:and number density and amount concentration by 1808:and the fraction of radiation absorbed is then 1771:, while "attenuation coefficient" measures the 3618:Spectral hemispherical attenuation coefficient 1961:Napierian and decadic attenuation coefficients 591:Spectral hemispherical attenuation coefficient 3903:. California, USA: Brooks/Cole. p. 529. 2970: 2145:Napierian narrow beam attenuation coefficient 82:of intensity, that is, the value of downward 8: 3925:"2nd Edition of the Glossary of Meteorology" 3693:Spectral directional attenuation coefficient 3582:, divided by that received by that surface. 3539:, divided by that received by that surface. 3508:, divided by that received by that surface. 3472:, divided by that received by that surface. 3446:, divided by that received by that surface. 3400:, divided by that received by that surface. 3369:, divided by that received by that surface. 3333:, divided by that received by that surface. 988:Spectral directional attenuation coefficient 377:, this equation is solved along a line from 2063:decadic narrow beam attenuation coefficient 78:. Most commonly, the quantity measures the 3862: 3860: 2977: 2963: 3152:at the same temperature as that surface. 3102:at the same temperature as that surface. 3067:at the same temperature as that surface. 3031:at the same temperature as that surface. 2891: 2881: 2875: 2866: 2860: 2830: 2825: 2817: 2804: 2798: 2789: 2783: 2656: 2646: 2636: 2625: 2597: 2587: 2576: 2550: 2524: 2514: 2504: 2493: 2471: 2461: 2450: 2423: 2421: 2359: 2351: 2332: 2320: 2261: 2246: 2236: 2231: 2223: 2206: 2188: 2183: 2175: 2163: 2095: 2086: 2080: 2024: 2011: 2001: 1989: 1920: 1909: 1908: 1902: 1890: 1879: 1878: 1872: 1860: 1851: 1849: 1724: 1723: 1697: 1696: 1673: 1643: 1642: 1616: 1615: 1592: 1568: 1567: 1547: 1546: 1529: 1505: 1504: 1484: 1483: 1466: 1442: 1441: 1421: 1420: 1403: 1385: 1384: 1370: 1369: 1351: 1349: 1228: 1207: 1206: 1197: 1194: 1173: 1172: 1163: 1141: 1119: 1098: 1097: 1088: 1085: 1064: 1063: 1054: 1032: 1024: 1022: 946: 931: 930: 921: 918: 903: 902: 893: 881: 875: 797: 782: 781: 772: 769: 754: 753: 744: 732: 726: 696: 681: 680: 671: 668: 653: 652: 643: 631: 625: 572: 550: 549: 543: 523: 498: 497: 491: 461: 447: 446: 432: 431: 425: 402: 382: 324: 315: 314: 305: 302: 293: 292: 283: 272: 2955: 16:Light or sound absorption in a substance 3856: 3750:Absorption (electromagnetic radiation) 1291:Absorption and scattering coefficients 3588:Hemispherical attenuation coefficient 2043:{\displaystyle I=I_{o}10^{-(dB/10)}.} 1812:. The absorption coefficient is thus 511:{\displaystyle \Phi _{\mathrm {e0} }} 7: 3478:Spectral hemispherical transmittance 2312:attenuation, these relations become 1788:and an absorbing cross section area 560:{\displaystyle \Phi _{\mathrm {e} }} 3658:Directional attenuation coefficient 858:directional attenuation coefficient 852:Directional attenuation coefficient 845:spectral radiant flux in wavelength 36:narrow-beam attenuation coefficient 4068:Compendium of Chemical Terminology 4019:. Dover Publications Inc. p.  3872:Compendium of Chemical Terminology 3545:Spectral directional transmittance 3339:Spectral hemispherical reflectance 3188:Spectral hemispherical absorptance 2262: 2207: 1910: 1880: 1732: 1725: 1705: 1698: 1674: 1651: 1644: 1624: 1617: 1593: 1576: 1569: 1555: 1548: 1530: 1506: 1485: 1443: 1422: 1386: 1371: 1229: 1215: 1208: 1198: 1181: 1174: 1142: 1120: 1106: 1099: 1089: 1072: 1065: 1033: 947: 939: 932: 922: 911: 904: 882: 834:spectral radiant flux in frequency 798: 783: 778: 773: 755: 750: 697: 682: 677: 672: 654: 649: 551: 546: 518:is the incoming radiation flux at 499: 494: 448: 443: 433: 428: 325: 316: 311: 306: 294: 289: 117:broad-beam attenuation coefficient 62:of attenuation coefficient is the 14: 3037:Spectral hemispherical emissivity 2141:Napierian attenuation coefficient 3406:Spectral directional reflectance 3263:Spectral directional absorptance 3929:American Meteorological Society 3108:Spectral directional emissivity 3098:, divided by that emitted by a 2059:decadic attenuation coefficient 1901: 1871: 1284:spectral radiance in wavelength 369:is the path length of the beam. 113:decadic attenuation coefficient 3003: 2952:Other radiometric coefficients 2668: 2662: 2615: 2609: 2562: 2556: 2536: 2530: 2483: 2477: 2436: 2430: 2258: 2252: 2203: 2197: 2032: 2015: 1297:Optical extinction coefficient 1271:spectral radiance in frequency 617:respectively, are defined as: 28:linear attenuation coefficient 1: 2743:molar attenuation coefficient 1014:respectively, are defined as 3820:Mass attenuation coefficient 1831:mass attenuation coefficient 1825:Mass attenuation coefficient 126:mass attenuation coefficient 3452:Hemispherical transmittance 2764:of the attenuating species 2745:of the attenuating species 2726:of the attenuating species 2707:of the attenuating species 1839:mass scattering coefficient 1835:mass absorption coefficient 4125: 4009:Subrahmanyan Chandrasekhar 1969: 1822: 1294: 217:radiative transfer in the 196:particle size distribution 18: 3514:Directional transmittance 3313:Hemispherical reflectance 3158:Hemispherical absorptance 2994: 2991: 2988: 567:is the radiation flux at 168:macroscopic cross section 3755:Absorption cross section 3011:Hemispherical emissivity 247:Mathematical definitions 4081:10.1351/goldbook.A00037 3885:10.1351/goldbook.A00516 3877:Attenuation coefficient 3805:Cross section (physics) 3375:Directional reflectance 3228:Directional absorptance 3148:, divided by that of a 3063:, divided by that of a 3059:Spectral exitance of a 3027:, divided by that of a 2958:Radiometry coefficients 2768:in the material sample, 2749:in the material sample; 2730:in the material sample; 2711:in the material sample; 2413:attenuating species as 2298:of the material sample; 258:attenuation coefficient 252:Attenuation coefficient 32:attenuation coefficient 4073:Absorption coefficient 3640:Spectral radiant flux 3073:Directional emissivity 3023:Radiant exitance of a 2906: 2843: 2682: 2641: 2592: 2509: 2466: 2377: 2278: 2120: 2044: 1935: 1754: 1329:scattering coefficient 1318:absorption coefficient 1250: 964: 815: 714: 581: 561: 532: 512: 477: 411: 391: 342: 198:, where it is denoted 180:, where it is denoted 178:ultrasound attenuation 152:, where it is denoted 68:Extinction coefficient 2907: 2844: 2683: 2621: 2572: 2489: 2446: 2407:amount concentrations 2398:theory for instance. 2390:attenuation occur in 2378: 2279: 2121: 2045: 1936: 1792:. For a slab of area 1755: 1331:of a volume, denoted 1320:of a volume, denoted 1295:Further information: 1251: 1000:of a volume, denoted 965: 860:of a volume, denoted 816: 715: 603:of a volume, denoted 582: 562: 533: 513: 478: 412: 392: 343: 260:of a volume, denoted 166:, where it is called 3830:Propagation constant 3765:Acoustic attenuation 2859: 2782: 2762:amount concentration 2420: 2319: 2162: 2139:is sometimes called 2079: 2053:Naperian attenuation 1988: 1848: 1348: 1021: 874: 725: 624: 571: 542: 522: 490: 424: 401: 381: 271: 21:Attenuation constant 4099:Physical quantities 3760:Absorption spectrum 3305:spectral absorbance 3220:spectral absorbance 2985: 2703:is the attenuation 2396:radiation shielding 2392:atmospheric science 2241: 2193: 194:for characterizing 156:and measured in cm; 121:radiation shielding 4015:Radiative Transfer 3815:High-energy X-rays 3795:Compton scattering 3775:Attenuation length 3725:Spectral radiance 3574:Spectral radiance 3438:Spectral radiance 3295:Spectral radiance 3140:Spectral radiance 2956: 2902: 2839: 2678: 2676: 2373: 2274: 2227: 2179: 2116: 2040: 1931: 1750: 1748: 1246: 1244: 960: 811: 710: 577: 557: 528: 508: 473: 407: 387: 338: 202:and measured in m. 174:and measured in m; 4030:978-0-486-60590-6 3910:978-0-534-49339-4 3840:Scattering theory 3741: 3740: 2935:penetration depth 2924:Avogadro constant 2897: 2894: 2823: 2807: 2394:applications and 2111: 1978:logarithmic units 1926: 1896: 1866: 1814:μ = n σ 1237: 1192: 1128: 1083: 955: 916: 806: 767: 705: 666: 580:{\displaystyle z} 531:{\displaystyle z} 410:{\displaystyle z} 390:{\displaystyle z} 333: 300: 231:for slant paths); 80:exponential decay 4116: 4085: 4035: 4034: 4018: 4005: 3999: 3998: 3996: 3995: 3976: 3957: 3954: 3948: 3945: 3939: 3938: 3936: 3935: 3921: 3915: 3914: 3896: 3890: 3889: 3864: 3835:Radiation length 3780:Beer–Lambert law 3719: 3707: 3669: 3634: 3627: 3594: 3568: 3556: 3525: 3494: 3487: 3458: 3432: 3420: 3386: 3355: 3348: 3319: 3289: 3277: 3239: 3204: 3197: 3164: 3134: 3122: 3084: 3053: 3046: 3017: 3005: 2986: 2979: 2972: 2965: 2931:half-value layer 2911: 2909: 2908: 2903: 2898: 2896: 2895: 2892: 2886: 2885: 2876: 2871: 2870: 2848: 2846: 2845: 2840: 2835: 2834: 2824: 2822: 2821: 2809: 2808: 2805: 2799: 2794: 2793: 2687: 2685: 2684: 2679: 2677: 2661: 2660: 2651: 2650: 2640: 2635: 2608: 2607: 2591: 2586: 2555: 2554: 2529: 2528: 2519: 2518: 2508: 2503: 2476: 2475: 2465: 2460: 2403:number densities 2382: 2380: 2379: 2374: 2369: 2368: 2364: 2363: 2343: 2342: 2283: 2281: 2280: 2275: 2270: 2269: 2265: 2251: 2250: 2240: 2235: 2215: 2214: 2210: 2192: 2187: 2153:Beer–Lambert law 2125: 2123: 2122: 2117: 2112: 2110: 2096: 2091: 2090: 2072:, is defined as 2049: 2047: 2046: 2041: 2036: 2035: 2028: 2006: 2005: 1940: 1938: 1937: 1932: 1927: 1925: 1924: 1915: 1914: 1913: 1903: 1897: 1895: 1894: 1885: 1884: 1883: 1873: 1867: 1865: 1864: 1852: 1759: 1757: 1756: 1751: 1749: 1742: 1741: 1728: 1715: 1714: 1701: 1684: 1683: 1661: 1660: 1647: 1634: 1633: 1620: 1603: 1602: 1580: 1579: 1572: 1559: 1558: 1551: 1534: 1533: 1517: 1516: 1509: 1496: 1495: 1488: 1471: 1470: 1454: 1453: 1446: 1433: 1432: 1425: 1408: 1407: 1391: 1390: 1389: 1376: 1375: 1374: 1255: 1253: 1252: 1247: 1245: 1238: 1236: 1232: 1226: 1225: 1224: 1211: 1201: 1195: 1193: 1191: 1190: 1177: 1164: 1152: 1151: 1129: 1127: 1123: 1117: 1116: 1115: 1102: 1092: 1086: 1084: 1082: 1081: 1068: 1055: 1043: 1042: 969: 967: 966: 961: 956: 954: 950: 944: 943: 942: 935: 925: 919: 917: 915: 914: 907: 894: 886: 885: 867:, is defined as 820: 818: 817: 812: 807: 805: 801: 795: 794: 793: 786: 776: 770: 768: 766: 765: 758: 745: 737: 736: 719: 717: 716: 711: 706: 704: 700: 694: 693: 692: 685: 675: 669: 667: 665: 664: 657: 644: 636: 635: 586: 584: 583: 578: 566: 564: 563: 558: 556: 555: 554: 537: 535: 534: 529: 517: 515: 514: 509: 507: 506: 505: 482: 480: 479: 474: 472: 471: 456: 455: 454: 438: 437: 436: 416: 414: 413: 408: 396: 394: 393: 388: 347: 345: 344: 339: 334: 332: 328: 322: 321: 320: 319: 309: 303: 301: 299: 298: 297: 284: 264:, is defined as 230: 184:and measured in 164:nuclear reactors 64:reciprocal metre 4124: 4123: 4119: 4118: 4117: 4115: 4114: 4113: 4089: 4088: 4083: 4044: 4039: 4038: 4031: 4007: 4006: 4002: 3993: 3991: 3990:catalogue. 1989 3978: 3977: 3960: 3955: 3951: 3946: 3942: 3933: 3931: 3923: 3922: 3918: 3911: 3898: 3897: 3893: 3887: 3865: 3858: 3853: 3810:Grey atmosphere 3746: 3718: 3709: 3708: 3706: 3697: 3668: 3662: 3633: 3629: 3628: 3626: 3622: 3592: 3567: 3558: 3557: 3555: 3549: 3524: 3518: 3493: 3489: 3488: 3486: 3482: 3456: 3431: 3422: 3421: 3419: 3410: 3385: 3379: 3354: 3350: 3349: 3347: 3343: 3317: 3288: 3279: 3278: 3276: 3267: 3238: 3232: 3203: 3199: 3198: 3196: 3192: 3162: 3133: 3124: 3123: 3121: 3112: 3083: 3077: 3052: 3048: 3047: 3045: 3041: 3015: 2984: 2983: 2954: 2921: 2887: 2877: 2862: 2857: 2856: 2826: 2810: 2800: 2785: 2780: 2779: 2759: 2740: 2721: 2702: 2675: 2674: 2652: 2642: 2593: 2565: 2546: 2543: 2542: 2520: 2510: 2467: 2439: 2418: 2417: 2355: 2347: 2328: 2317: 2316: 2242: 2219: 2171: 2160: 2159: 2100: 2082: 2077: 2076: 2071: 2055: 2007: 1997: 1986: 1985: 1974: 1968: 1963: 1952: 1916: 1904: 1886: 1874: 1856: 1846: 1845: 1841:are defined as 1827: 1821: 1782: 1747: 1746: 1719: 1692: 1685: 1669: 1666: 1665: 1638: 1611: 1604: 1588: 1585: 1584: 1563: 1542: 1535: 1525: 1522: 1521: 1500: 1479: 1472: 1462: 1459: 1458: 1437: 1416: 1409: 1399: 1396: 1395: 1380: 1365: 1358: 1346: 1345: 1337: 1326: 1301:When a narrow ( 1299: 1293: 1281: 1268: 1243: 1242: 1227: 1202: 1196: 1168: 1153: 1137: 1134: 1133: 1118: 1093: 1087: 1059: 1044: 1028: 1019: 1018: 1013: 1006: 990: 979: 945: 926: 920: 898: 877: 872: 871: 866: 854: 842: 831: 796: 777: 771: 749: 728: 723: 722: 695: 676: 670: 648: 627: 622: 621: 616: 609: 593: 569: 568: 545: 540: 539: 520: 519: 493: 488: 487: 457: 442: 427: 422: 421: 399: 398: 379: 378: 358: 323: 310: 304: 288: 269: 268: 254: 249: 222: 135: 24: 17: 12: 11: 5: 4122: 4120: 4112: 4111: 4106: 4101: 4091: 4090: 4087: 4086: 4060: 4055: 4050: 4043: 4042:External links 4040: 4037: 4036: 4029: 4000: 3958: 3949: 3940: 3916: 3909: 3901:Modern Physics 3891: 3855: 3854: 3852: 3849: 3848: 3847: 3842: 3837: 3832: 3827: 3825:Mean free path 3822: 3817: 3812: 3807: 3802: 3797: 3792: 3787: 3785:Cargo scanning 3782: 3777: 3772: 3767: 3762: 3757: 3752: 3745: 3742: 3739: 3738: 3723: 3720: 3713: 3701: 3695: 3689: 3688: 3673: 3670: 3666: 3660: 3654: 3653: 3638: 3635: 3631: 3624: 3620: 3614: 3613: 3598: 3595: 3590: 3584: 3583: 3572: 3569: 3562: 3553: 3547: 3541: 3540: 3529: 3526: 3522: 3516: 3510: 3509: 3500:Spectral flux 3498: 3495: 3491: 3484: 3480: 3474: 3473: 3462: 3459: 3454: 3448: 3447: 3436: 3433: 3426: 3414: 3408: 3402: 3401: 3390: 3387: 3383: 3377: 3371: 3370: 3361:Spectral flux 3359: 3356: 3352: 3345: 3341: 3335: 3334: 3323: 3320: 3315: 3309: 3308: 3293: 3290: 3283: 3271: 3265: 3259: 3258: 3243: 3240: 3236: 3230: 3224: 3223: 3210:Spectral flux 3208: 3205: 3201: 3194: 3190: 3184: 3183: 3168: 3165: 3160: 3154: 3153: 3138: 3135: 3128: 3116: 3110: 3104: 3103: 3088: 3085: 3081: 3075: 3069: 3068: 3057: 3054: 3050: 3043: 3039: 3033: 3032: 3021: 3018: 3013: 3007: 3006: 3001: 2997: 2996: 2993: 2990: 2982: 2981: 2974: 2967: 2959: 2957: 2953: 2950: 2942:mean free path 2919: 2913: 2912: 2901: 2890: 2884: 2880: 2874: 2869: 2865: 2850: 2849: 2838: 2833: 2829: 2820: 2816: 2813: 2803: 2797: 2792: 2788: 2770: 2769: 2755: 2750: 2736: 2731: 2724:number density 2717: 2712: 2698: 2689: 2688: 2673: 2670: 2667: 2664: 2659: 2655: 2649: 2645: 2639: 2634: 2631: 2628: 2624: 2620: 2617: 2614: 2611: 2606: 2603: 2600: 2596: 2590: 2585: 2582: 2579: 2575: 2571: 2568: 2566: 2564: 2561: 2558: 2553: 2549: 2545: 2544: 2541: 2538: 2535: 2532: 2527: 2523: 2517: 2513: 2507: 2502: 2499: 2496: 2492: 2488: 2485: 2482: 2479: 2474: 2470: 2464: 2459: 2456: 2453: 2449: 2445: 2442: 2440: 2438: 2435: 2432: 2429: 2426: 2425: 2384: 2383: 2372: 2367: 2362: 2358: 2354: 2350: 2346: 2341: 2338: 2335: 2331: 2327: 2324: 2306: 2305: 2299: 2285: 2284: 2273: 2268: 2264: 2260: 2257: 2254: 2249: 2245: 2239: 2234: 2230: 2226: 2222: 2218: 2213: 2209: 2205: 2202: 2199: 2196: 2191: 2186: 2182: 2178: 2174: 2170: 2167: 2127: 2126: 2115: 2109: 2106: 2103: 2099: 2094: 2089: 2085: 2069: 2054: 2051: 2039: 2034: 2031: 2027: 2023: 2020: 2017: 2014: 2010: 2004: 2000: 1996: 1993: 1970:Main article: 1967: 1964: 1962: 1959: 1948: 1942: 1941: 1930: 1923: 1919: 1912: 1907: 1900: 1893: 1889: 1882: 1877: 1870: 1863: 1859: 1855: 1823:Main article: 1820: 1817: 1796:and thickness 1781: 1778: 1761: 1760: 1745: 1740: 1737: 1734: 1731: 1727: 1722: 1718: 1713: 1710: 1707: 1704: 1700: 1695: 1691: 1688: 1686: 1682: 1679: 1676: 1672: 1668: 1667: 1664: 1659: 1656: 1653: 1650: 1646: 1641: 1637: 1632: 1629: 1626: 1623: 1619: 1614: 1610: 1607: 1605: 1601: 1598: 1595: 1591: 1587: 1586: 1583: 1578: 1575: 1571: 1566: 1562: 1557: 1554: 1550: 1545: 1541: 1538: 1536: 1532: 1528: 1524: 1523: 1520: 1515: 1512: 1508: 1503: 1499: 1494: 1491: 1487: 1482: 1478: 1475: 1473: 1469: 1465: 1461: 1460: 1457: 1452: 1449: 1445: 1440: 1436: 1431: 1428: 1424: 1419: 1415: 1412: 1410: 1406: 1402: 1398: 1397: 1394: 1388: 1383: 1379: 1373: 1368: 1364: 1361: 1359: 1357: 1354: 1353: 1335: 1324: 1292: 1289: 1288: 1287: 1279: 1274: 1266: 1257: 1256: 1241: 1235: 1231: 1223: 1220: 1217: 1214: 1210: 1205: 1200: 1189: 1186: 1183: 1180: 1176: 1171: 1167: 1162: 1159: 1156: 1154: 1150: 1147: 1144: 1140: 1136: 1135: 1132: 1126: 1122: 1114: 1111: 1108: 1105: 1101: 1096: 1091: 1080: 1077: 1074: 1071: 1067: 1062: 1058: 1053: 1050: 1047: 1045: 1041: 1038: 1035: 1031: 1027: 1026: 1011: 1004: 989: 986: 977: 971: 970: 959: 953: 949: 941: 938: 934: 929: 924: 913: 910: 906: 901: 897: 892: 889: 884: 880: 864: 853: 850: 849: 848: 840: 837: 829: 822: 821: 810: 804: 800: 792: 789: 785: 780: 775: 764: 761: 757: 752: 748: 743: 740: 735: 731: 720: 709: 703: 699: 691: 688: 684: 679: 674: 663: 660: 656: 651: 647: 642: 639: 634: 630: 614: 607: 592: 589: 576: 553: 548: 527: 504: 501: 496: 484: 483: 470: 467: 464: 460: 453: 450: 445: 441: 435: 430: 406: 386: 371: 370: 364: 356: 349: 348: 337: 331: 327: 318: 313: 308: 296: 291: 287: 282: 279: 276: 253: 250: 248: 245: 233: 232: 204: 203: 189: 175: 157: 134: 131: 111:, such as the 15: 13: 10: 9: 6: 4: 3: 2: 4121: 4110: 4107: 4105: 4102: 4100: 4097: 4096: 4094: 4082: 4078: 4074: 4070: 4069: 4064: 4061: 4059: 4056: 4054: 4051: 4049: 4046: 4045: 4041: 4032: 4026: 4022: 4017: 4016: 4010: 4004: 4001: 3989: 3985: 3984:ISO 9288:1989 3981: 3975: 3973: 3971: 3969: 3967: 3965: 3963: 3959: 3953: 3950: 3944: 3941: 3930: 3926: 3920: 3917: 3912: 3906: 3902: 3895: 3892: 3886: 3882: 3878: 3874: 3873: 3868: 3863: 3861: 3857: 3850: 3846: 3845:Transmittance 3843: 3841: 3838: 3836: 3833: 3831: 3828: 3826: 3823: 3821: 3818: 3816: 3813: 3811: 3808: 3806: 3803: 3801: 3798: 3796: 3793: 3791: 3788: 3786: 3783: 3781: 3778: 3776: 3773: 3771: 3768: 3766: 3763: 3761: 3758: 3756: 3753: 3751: 3748: 3747: 3743: 3736: 3732: 3728: 3724: 3721: 3717: 3712: 3705: 3700: 3696: 3694: 3691: 3690: 3686: 3682: 3678: 3674: 3671: 3665: 3661: 3659: 3656: 3655: 3651: 3647: 3643: 3639: 3636: 3621: 3619: 3616: 3615: 3611: 3607: 3603: 3600:Radiant flux 3599: 3596: 3591: 3589: 3586: 3585: 3581: 3577: 3573: 3570: 3566: 3561: 3552: 3548: 3546: 3543: 3542: 3538: 3534: 3530: 3527: 3521: 3517: 3515: 3512: 3511: 3507: 3503: 3499: 3496: 3481: 3479: 3476: 3475: 3471: 3467: 3464:Radiant flux 3463: 3460: 3455: 3453: 3450: 3449: 3445: 3441: 3437: 3434: 3430: 3425: 3418: 3413: 3409: 3407: 3404: 3403: 3399: 3395: 3391: 3388: 3382: 3378: 3376: 3373: 3372: 3368: 3364: 3360: 3357: 3342: 3340: 3337: 3336: 3332: 3328: 3325:Radiant flux 3324: 3321: 3316: 3314: 3311: 3310: 3306: 3302: 3298: 3294: 3291: 3287: 3282: 3275: 3270: 3266: 3264: 3261: 3260: 3256: 3252: 3248: 3244: 3241: 3235: 3231: 3229: 3226: 3225: 3221: 3217: 3213: 3209: 3206: 3191: 3189: 3186: 3185: 3181: 3177: 3173: 3170:Radiant flux 3169: 3166: 3161: 3159: 3156: 3155: 3151: 3147: 3143: 3139: 3136: 3132: 3127: 3120: 3115: 3111: 3109: 3106: 3105: 3101: 3097: 3093: 3089: 3086: 3080: 3076: 3074: 3071: 3070: 3066: 3062: 3058: 3055: 3040: 3038: 3035: 3034: 3030: 3026: 3022: 3019: 3014: 3012: 3009: 3008: 3002: 2999: 2998: 2987: 2980: 2975: 2973: 2968: 2966: 2961: 2960: 2951: 2949: 2947: 2946:cross section 2943: 2938: 2936: 2932: 2927: 2925: 2918: 2899: 2888: 2882: 2878: 2872: 2867: 2863: 2855: 2854: 2853: 2836: 2831: 2827: 2818: 2814: 2811: 2801: 2795: 2790: 2786: 2778: 2777: 2776: 2773: 2767: 2763: 2758: 2754: 2751: 2748: 2744: 2739: 2735: 2732: 2729: 2725: 2720: 2716: 2713: 2710: 2706: 2705:cross section 2701: 2697: 2694: 2693: 2692: 2671: 2665: 2657: 2653: 2647: 2643: 2637: 2632: 2629: 2626: 2622: 2618: 2612: 2604: 2601: 2598: 2594: 2588: 2583: 2580: 2577: 2573: 2569: 2567: 2559: 2551: 2547: 2539: 2533: 2525: 2521: 2515: 2511: 2505: 2500: 2497: 2494: 2490: 2486: 2480: 2472: 2468: 2462: 2457: 2454: 2451: 2447: 2443: 2441: 2433: 2427: 2416: 2415: 2414: 2412: 2408: 2404: 2399: 2397: 2393: 2389: 2370: 2365: 2360: 2356: 2352: 2348: 2344: 2339: 2336: 2333: 2329: 2325: 2322: 2315: 2314: 2313: 2311: 2303: 2300: 2297: 2296:transmittance 2293: 2290: 2289: 2288: 2271: 2266: 2255: 2247: 2243: 2237: 2232: 2228: 2224: 2220: 2216: 2211: 2200: 2194: 2189: 2184: 2180: 2176: 2172: 2168: 2165: 2158: 2157: 2156: 2154: 2150: 2146: 2142: 2138: 2134: 2132: 2113: 2107: 2104: 2101: 2097: 2092: 2087: 2083: 2075: 2074: 2073: 2068: 2064: 2060: 2052: 2050: 2037: 2029: 2025: 2021: 2018: 2012: 2008: 2002: 1998: 1994: 1991: 1983: 1979: 1973: 1965: 1960: 1958: 1956: 1951: 1947: 1928: 1921: 1917: 1905: 1898: 1891: 1887: 1875: 1868: 1861: 1857: 1853: 1844: 1843: 1842: 1840: 1836: 1832: 1826: 1818: 1816: 1815: 1811: 1807: 1806:n A σ dz 1803: 1799: 1795: 1791: 1787: 1779: 1777: 1774: 1770: 1765: 1743: 1738: 1735: 1729: 1720: 1716: 1711: 1708: 1702: 1693: 1689: 1687: 1680: 1677: 1670: 1662: 1657: 1654: 1648: 1639: 1635: 1630: 1627: 1621: 1612: 1608: 1606: 1599: 1596: 1589: 1581: 1573: 1564: 1560: 1552: 1543: 1539: 1537: 1526: 1518: 1513: 1510: 1501: 1497: 1492: 1489: 1480: 1476: 1474: 1467: 1463: 1455: 1450: 1447: 1438: 1434: 1429: 1426: 1417: 1413: 1411: 1404: 1400: 1392: 1381: 1377: 1366: 1362: 1360: 1355: 1344: 1343: 1342: 1339: 1334: 1330: 1323: 1319: 1314: 1312: 1308: 1304: 1298: 1290: 1285: 1278: 1275: 1272: 1265: 1262: 1261: 1260: 1239: 1233: 1221: 1218: 1212: 1203: 1187: 1184: 1178: 1169: 1165: 1160: 1157: 1155: 1148: 1145: 1138: 1130: 1124: 1112: 1109: 1103: 1094: 1078: 1075: 1069: 1060: 1056: 1051: 1048: 1046: 1039: 1036: 1029: 1017: 1016: 1015: 1010: 1003: 999: 995: 987: 985: 983: 976: 957: 951: 936: 927: 908: 899: 895: 890: 887: 878: 870: 869: 868: 863: 859: 851: 846: 838: 835: 827: 826: 825: 808: 802: 790: 787: 762: 759: 746: 741: 738: 733: 729: 721: 707: 701: 689: 686: 661: 658: 645: 640: 637: 632: 628: 620: 619: 618: 613: 606: 602: 598: 590: 588: 574: 525: 502: 468: 465: 462: 458: 451: 439: 420: 419: 418: 404: 384: 376: 368: 365: 362: 354: 353: 352: 335: 329: 285: 280: 277: 274: 267: 266: 265: 263: 259: 251: 246: 244: 242: 238: 229: 225: 220: 216: 212: 209: 208: 207: 201: 197: 193: 190: 187: 183: 179: 176: 173: 169: 165: 161: 158: 155: 151: 147: 144: 143: 142: 140: 132: 130: 128: 127: 122: 118: 114: 110: 106: 102: 98: 97: 92: 88: 86: 81: 77: 73: 69: 65: 61: 57: 53: 49: 45: 41: 37: 33: 29: 22: 4066: 4014: 4003: 3992:. Retrieved 3983: 3952: 3943: 3932:. Retrieved 3919: 3900: 3894: 3870: 3790:Compton edge 3734: 3730: 3726: 3715: 3710: 3703: 3698: 3692: 3684: 3680: 3676: 3663: 3657: 3649: 3645: 3641: 3617: 3609: 3605: 3601: 3587: 3579: 3575: 3564: 3559: 3550: 3536: 3532: 3519: 3505: 3501: 3469: 3465: 3443: 3439: 3428: 3423: 3416: 3411: 3397: 3393: 3380: 3366: 3362: 3330: 3326: 3300: 3296: 3285: 3280: 3273: 3268: 3250: 3246: 3233: 3215: 3211: 3175: 3171: 3149: 3145: 3141: 3130: 3125: 3118: 3113: 3099: 3095: 3091: 3078: 3064: 3060: 3028: 3024: 2939: 2928: 2916: 2914: 2851: 2774: 2771: 2765: 2756: 2752: 2746: 2737: 2733: 2727: 2718: 2714: 2708: 2699: 2695: 2690: 2410: 2400: 2387: 2385: 2309: 2307: 2301: 2291: 2286: 2144: 2140: 2136: 2135: 2130: 2128: 2066: 2062: 2058: 2056: 1975: 1955:mass density 1949: 1945: 1943: 1838: 1834: 1830: 1828: 1813: 1809: 1805: 1801: 1797: 1793: 1789: 1785: 1783: 1772: 1768: 1766: 1762: 1340: 1332: 1328: 1321: 1317: 1315: 1300: 1276: 1263: 1258: 1008: 1001: 997: 993: 991: 974: 972: 861: 857: 855: 823: 611: 604: 600: 596: 594: 485: 374: 372: 366: 361:radiant flux 350: 261: 257: 255: 234: 227: 223: 205: 199: 181: 171: 167: 153: 139:radiant flux 136: 124: 116: 112: 108: 104: 100: 94: 90: 84: 67: 35: 31: 27: 25: 3770:Attenuation 3576:transmitted 3533:transmitted 3502:transmitted 3466:transmitted 2388:non-uniform 2308:In case of 2149:exponential 1810:n σ dz 237:transparent 115:below. The 76:climatology 72:meteorology 50:, or other 4104:Radiometry 4093:Categories 3994:2015-03-15 3934:2015-11-03 3851:References 3255:absorbance 3180:absorbance 3150:black body 3100:black body 3065:black body 3029:black body 2065:, denoted 1327:, and the 1311:scattering 1307:absorption 1303:collimated 219:atmosphere 150:gamma rays 4109:Acoustics 3731:scattered 3681:scattered 3675:Radiance 3646:scattered 3606:scattered 3531:Radiance 3440:reflected 3394:reflected 3392:Radiance 3363:reflected 3327:reflected 3245:Radiance 3090:Radiance 2992:SI units 2989:Quantity 2828:σ 2815:⁡ 2787:ε 2644:ε 2623:∑ 2595:μ 2574:∑ 2548:μ 2512:σ 2491:∑ 2469:μ 2448:∑ 2428:μ 2386:Cases of 2366:ℓ 2357:μ 2353:− 2340:ℓ 2337:μ 2334:− 2244:μ 2238:ℓ 2229:∫ 2225:− 2195:μ 2190:ℓ 2181:∫ 2177:− 2105:⁡ 2098:μ 2084:μ 2013:− 1918:ρ 1906:μ 1888:ρ 1876:μ 1858:ρ 1854:μ 1739:λ 1733:Ω 1721:μ 1712:λ 1706:Ω 1694:μ 1681:λ 1675:Ω 1671:μ 1658:ν 1652:Ω 1640:μ 1631:ν 1625:Ω 1613:μ 1600:ν 1594:Ω 1590:μ 1577:Ω 1565:μ 1556:Ω 1544:μ 1531:Ω 1527:μ 1514:λ 1502:μ 1493:λ 1481:μ 1468:λ 1464:μ 1451:ν 1439:μ 1430:ν 1418:μ 1405:ν 1401:μ 1382:μ 1367:μ 1356:μ 1222:λ 1216:Ω 1188:λ 1182:Ω 1161:− 1149:λ 1143:Ω 1139:μ 1113:ν 1107:Ω 1079:ν 1073:Ω 1052:− 1040:ν 1034:Ω 1030:μ 940:Ω 912:Ω 891:− 883:Ω 879:μ 791:λ 779:Φ 763:λ 751:Φ 742:− 734:λ 730:μ 690:ν 678:Φ 662:ν 650:Φ 641:− 633:ν 629:μ 547:Φ 495:Φ 466:μ 463:− 444:Φ 429:Φ 312:Φ 290:Φ 281:− 275:μ 192:acoustics 48:particles 4011:(1960). 3744:See also 3727:absorbed 3677:absorbed 3642:absorbed 3602:absorbed 3297:absorbed 3247:absorbed 3212:absorbed 3172:absorbed 2405:and the 1982:decibels 1966:Decibels 982:radiance 215:infrared 188:⋅cm⋅MHz; 160:neutrons 133:Overview 87:-folding 3580:surface 3537:surface 3506:surface 3470:surface 3444:surface 3398:surface 3367:surface 3331:surface 3301:surface 3251:surface 3216:surface 3176:surface 3146:surface 3142:emitted 3096:surface 3092:emitted 3061:surface 3025:surface 2922:is the 2760:is the 2741:is the 2722:is the 2409:of its 2310:uniform 2294:is the 2151:in the 1972:decibel 1953:is the 1282:is the 1269:is the 980:is the 843:is the 832:is the 538:=0 and 359:is the 241:opacity 60:SI unit 4027:  3907:  3735:volume 3685:volume 3650:volume 3610:volume 2995:Notes 2915:where 2691:where 2287:where 1944:where 1837:, and 1802:n A dz 1790:σ 1259:where 973:where 824:where 486:where 397:=0 to 351:where 226:= cos 146:X-rays 123:. The 56:matter 52:energy 4063:IUPAC 3867:IUPAC 3733:by a 3683:by a 3648:by a 3608:by a 3578:by a 3535:by a 3504:by a 3468:by a 3442:by a 3396:by a 3365:by a 3329:by a 3299:by a 3249:by a 3214:by a 3174:by a 3144:by a 3094:by a 3000:Name 1773:total 1769:alone 1280:e,Ω,λ 1267:e,Ω,ν 211:solar 103:, or 66:(m). 44:sound 40:light 34:, or 4025:ISBN 3905:ISBN 3729:and 3679:and 3644:and 3604:and 3004:Sym. 2929:The 2057:The 1829:The 1316:The 1309:and 1007:and 996:and 992:The 856:The 610:and 599:and 595:The 417:as: 256:The 213:and 162:and 91:e.g. 74:and 26:The 4077:doi 4075:". 4021:355 3988:ISO 3881:doi 3879:". 3554:Ω,ν 3307:". 3257:". 3222:". 3182:". 2143:or 2061:or 1980:of 1012:Ω,λ 1005:Ω,ν 978:e,Ω 841:e,λ 830:e,ν 148:or 54:or 4095:: 4065:, 4023:. 3986:. 3982:. 3961:^ 3927:. 3869:, 3859:^ 3722:m 3714:Ω, 3702:Ω, 3672:m 3637:m 3597:m 3571:— 3563:Ω, 3528:— 3497:— 3461:— 3435:— 3427:Ω, 3415:Ω, 3389:— 3358:— 3322:— 3292:— 3284:Ω, 3272:Ω, 3242:— 3207:— 3167:— 3137:— 3129:Ω, 3117:Ω, 3087:— 3056:— 3020:— 2948:. 2926:. 2819:10 2812:ln 2599:10 2552:10 2361:10 2349:10 2248:10 2221:10 2108:10 2102:ln 2088:10 2070:10 2030:10 2009:10 1957:. 1833:, 1798:dz 984:. 587:. 186:dB 46:, 42:, 30:, 4079:: 4033:. 3997:. 3937:. 3913:. 3883:: 3716:λ 3711:μ 3704:ν 3699:μ 3667:Ω 3664:μ 3632:λ 3630:μ 3625:ν 3623:μ 3593:μ 3565:λ 3560:T 3551:T 3523:Ω 3520:T 3492:λ 3490:T 3485:ν 3483:T 3457:T 3429:λ 3424:R 3417:ν 3412:R 3384:Ω 3381:R 3353:λ 3351:R 3346:ν 3344:R 3318:R 3286:λ 3281:A 3274:ν 3269:A 3237:Ω 3234:A 3202:λ 3200:A 3195:ν 3193:A 3163:A 3131:λ 3126:ε 3119:ν 3114:ε 3082:Ω 3079:ε 3051:λ 3049:ε 3044:ν 3042:ε 3016:ε 2978:e 2971:t 2964:v 2920:A 2917:N 2900:, 2893:A 2889:N 2883:i 2879:n 2873:= 2868:i 2864:c 2837:, 2832:i 2806:A 2802:N 2796:= 2791:i 2766:i 2757:i 2753:c 2747:i 2738:i 2734:ε 2728:i 2719:i 2715:n 2709:i 2700:i 2696:σ 2672:, 2669:) 2666:z 2663:( 2658:i 2654:c 2648:i 2638:N 2633:1 2630:= 2627:i 2619:= 2616:) 2613:z 2610:( 2605:i 2602:, 2589:N 2584:1 2581:= 2578:i 2570:= 2563:) 2560:z 2557:( 2540:, 2537:) 2534:z 2531:( 2526:i 2522:n 2516:i 2506:N 2501:1 2498:= 2495:i 2487:= 2484:) 2481:z 2478:( 2473:i 2463:N 2458:1 2455:= 2452:i 2444:= 2437:) 2434:z 2431:( 2411:N 2371:. 2345:= 2330:e 2326:= 2323:T 2302:ℓ 2292:T 2272:, 2267:z 2263:d 2259:) 2256:z 2253:( 2233:0 2217:= 2212:z 2208:d 2204:) 2201:z 2198:( 2185:0 2173:e 2169:= 2166:T 2137:μ 2131:e 2114:. 2093:= 2067:μ 2038:. 2033:) 2026:/ 2022:B 2019:d 2016:( 2003:o 1999:I 1995:= 1992:I 1950:m 1946:ρ 1929:, 1922:m 1911:s 1899:, 1892:m 1881:a 1869:, 1862:m 1794:A 1786:n 1744:. 1736:, 1730:, 1726:s 1717:+ 1709:, 1703:, 1699:a 1690:= 1678:, 1663:, 1655:, 1649:, 1645:s 1636:+ 1628:, 1622:, 1618:a 1609:= 1597:, 1582:, 1574:, 1570:s 1561:+ 1553:, 1549:a 1540:= 1519:, 1511:, 1507:s 1498:+ 1490:, 1486:a 1477:= 1456:, 1448:, 1444:s 1435:+ 1427:, 1423:a 1414:= 1393:, 1387:s 1378:+ 1372:a 1363:= 1336:s 1333:μ 1325:a 1322:μ 1286:. 1277:L 1273:; 1264:L 1240:, 1234:z 1230:d 1219:, 1213:, 1209:e 1204:L 1199:d 1185:, 1179:, 1175:e 1170:L 1166:1 1158:= 1146:, 1131:, 1125:z 1121:d 1110:, 1104:, 1100:e 1095:L 1090:d 1076:, 1070:, 1066:e 1061:L 1057:1 1049:= 1037:, 1009:μ 1002:μ 975:L 958:, 952:z 948:d 937:, 933:e 928:L 923:d 909:, 905:e 900:L 896:1 888:= 865:Ω 862:μ 847:. 839:Φ 836:; 828:Φ 809:, 803:z 799:d 788:, 784:e 774:d 760:, 756:e 747:1 739:= 708:, 702:z 698:d 687:, 683:e 673:d 659:, 655:e 646:1 638:= 615:λ 612:μ 608:ν 605:μ 575:z 552:e 526:z 503:0 500:e 469:z 459:e 452:0 449:e 440:= 434:e 405:z 385:z 375:z 367:z 363:; 357:e 355:Φ 336:, 330:z 326:d 317:e 307:d 295:e 286:1 278:= 262:μ 228:θ 224:μ 200:α 182:α 172:Σ 154:μ 109:e 105:e 101:e 96:e 85:e 23:.

Index

Attenuation constant
light
sound
particles
energy
matter
SI unit
reciprocal metre
meteorology
climatology
exponential decay
e-folding
e
radiation shielding
mass attenuation coefficient
radiant flux
X-rays
gamma rays
neutrons
nuclear reactors
ultrasound attenuation
dB
acoustics
particle size distribution
solar
infrared
atmosphere
transparent
opacity
radiant flux

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