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instruments using radioactive cobalt sources. The first treatment of a patient using the new source was carried out in London, Ontario, on 27 October 1951. In
November 1951, the first Saskatoon patient, a 43-year-old mother of four, was treated for cervical cancer with a carefully calibrated dose of
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To further scientific and medical collaborations between radiologists, radiotherapists, physicians, and physicists, Johns guided the creation of the
Graduate Department in Medical Biophysics at the University of Toronto in 1958. Johns served as the second chair of the department, succeeding
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near the end of the war were expanded and opened to civilian research projects. The first operational nuclear reactor outside the United States - the
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Over the course of his career, Johns supervised 68 graduate students, published more than 200 peer-reviewed papers, and with
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Interest in nuclear technology burgeoned in post-war Canada. Nuclear research facilities constructed at the
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Johns married Sybil
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In 1956, Johns assumed the headship of the physics division of the
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293:. eds. J.A. Aldrich and B.C. Lentle, The Canadian Association of Radiologists, Montreal 1995.
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After the close of the war, Johns was invited to work with Ertle
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Two groups - Johns's at the
University of Saskatchewan, and another one in
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Johns's original treatment device was used in
Saskatchewan until 1972.
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testing of metal aircraft castings. A meeting in August 1946 with
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A New Kind of Ray: The
Radiological Sciences in Canada 1895-1995
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and physics experience, Johns was also involved in non-invasive
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magazine had dubbed the cobalt-source radiotherapy machine the
113:. For the duration of the war, he taught physics, mathematics,
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141:, contributed to Johns's making a career in medical physics.
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The
Canadian Science and Engineering Hall of Fame: The Hall
34:, noted for his extensive contributions to the use of
242:, published the textbook "The Physics of Radiology".
137:, while Mayneord was at the Atomic Energy Project at
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Presidents of the
Canadian Association of Physicists
307:1,000-curie cobalt 60 units for radiation therapy.
121:to newly recruited airplane pilots as part of the
1289:Academic staff of the University of Saskatchewan
109:Johns' graduation coincided with the start of
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278:Canadian Science and Engineering Hall of Fame
148:Development of cobalt-60 in medical treatment
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1294:Academic staff of the University of Toronto
89:degree (BSc) in 1936. He then moved to the
27:(4 July 1915 – 23 August 1998) was a
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296:Johns, Harold E. and Cunningham, John R.
50:Johns was born to missionary parents in
342:, Canada Science and Technology Museum.
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73:In Hamilton, Johns pursued a degree in
123:British Commonwealth Air Training Plan
300:, Charles C Thomas, Springfield 1983.
298:The Physics of Radiology, 4th Edition
264:Emeritus University Professor of the
7:
303:Johns, H.E., Bates L.M., Epp E.R.,
101:(PhD) degrees in physics in 1939.
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358:from the Canadian Nuclear Society
1284:Officers of the Order of Canada
1:
394:Canadian Medical Hall of Fame
271:Canadian Medical Hall of Fame
1299:University of Toronto alumni
1269:Canadian medical researchers
1233:Marie-Marguerite d'Youville
194:- designed and constructed
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1304:McMaster University alumni
225:Princess Margaret Hospital
196:external beam radiotherapy
154:University of Saskatchewan
135:William Valentine Mayneord
16:Canadian medical physicist
963:Jonathan Campbell Meakins
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252:Henry Marshall Tory Medal
1073:Cheryl Rockman-Greenberg
1008:William Thornton Mustard
875:Charles Philippe Leblond
219:Ontario Cancer Institute
177:Chalk River Laboratories
66:, his family settled in
46:Early life and education
1279:Physicists from Sichuan
571:William Arthur Cochrane
85:, and he completed his
1174:Lucille Teasdale-Corti
988:Frederick Montizambert
493:Wilfred Gordon Bigelow
93:, where he earned his
289:Greenstock, Clive L.
266:University of Toronto
199:cobalt-60 radiation.
91:University of Toronto
1131:F. Estelle R. Simons
629:Charles George Drake
556:Harvey Max Chochinov
315:(4285):1035-6, 1951.
181:Chalk River, Ontario
139:Chalk River, Ontario
99:Doctor of Philosophy
1274:Canadian physicists
1088:Jean-Lucien Rouleau
776:Emmett Matthew Hall
586:Douglas Harold Copp
448:Charles Thomas Beer
438:Henry J. M. Barnett
392:Inductees into the
356:Biographical sketch
87:Bachelor of Science
83:McMaster University
20:Harold Elford Johns
1309:Medical physicists
1194:Sir Charles Tupper
1136:Duncan G. Sinclair
998:Thomas John Murray
826:Charles B. Huggins
811:Charles Hollenberg
791:Donald Olding Hebb
781:Judith Goslin Hall
766:Vladimir Hachinski
690:John G. FitzGerald
468:Michel G. Bergeron
338:2014-11-09 at the
240:John R. Cunningham
60:Tacoma, Washington
36:ionizing radiation
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1126:Louis Siminovitch
786:Michael R. Hayden
743:Richard Goldbloom
657:John Robert Evans
634:Daniel J. Drucker
508:Adolfo J. de Bold
433:Frederick Banting
428:Elizabeth Bagshaw
166:radiation therapy
68:Hamilton, Ontario
64:Brandon, Manitoba
32:medical physicist
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1199:D. Lorne Tyrrell
1151:Bette Stephenson
1111:Robert B. Salter
1034:Annette O'Connor
953:Joseph B. Martin
913:Walter Mackenzie
903:Ernest McCulloch
839:David J. Jenkins
753:Wilfred Grenfell
685:C. Miller Fisher
609:Thomas A. Dignan
528:G. Malcolm Brown
503:Stephen Blizzard
488:John Bienenstock
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880:Maurice LeClair
844:Harold E. Johns
801:FĂ©lix d'Herelle
733:Gustave Gingras
705:Armand Frappier
675:William Feindel
665:Ray Farquharson
604:Naranjan Dhalla
566:Michel Chrétien
546:Elaine A. Carty
458:Bernard Belleau
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284:Further reading
273:inductee (1998)
259:Order of Canada
257:Officer of the
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202:In early 1952,
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164:source for the
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1021:David Naylor
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928:John Macleod
898:Jeanne Mance
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865:Marc Lalonde
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857:Leonora King
852:Wilbert Keon
846:
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680:Brett Finlay
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652:Connie Eaves
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105:Early career
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1264:1998 deaths
1259:1915 births
1238:Salim Yusuf
1161:Emily Stowe
1057:Vera Peters
968:Maud Menten
948:Marco Marra
943:Tak Wah Mak
933:John McCrae
821:David Hubel
591:Max Cynader
561:Bruce Chown
533:John Browne
443:Murray Barr
210:cobalt bomb
127:radiography
75:mathematics
1253:Categories
1179:James Till
1121:Hans Selye
1098:Ian Rusted
1093:Claude Roy
806:Jack Hirsh
614:John Dirks
599:Paul David
320:References
233:Arthur Ham
748:Jean Gray
738:Phil Gold
700:Terry Fox
576:May Cohen
235:in 1960.
205:Maclean's
162:gamma ray
158:cobalt-60
62:, and in
38:to treat
453:John Bel
336:Archived
29:Canadian
79:physics
52:Sichuan
309:Nature
305:et al.
261:(1978)
254:(1971)
246:Awards
170:cancer
117:, and
40:cancer
160:as a
131:X-ray
56:China
97:and
77:and
313:168
185:NRX
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423:B
405:A
385:e
378:t
371:v
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