This Article Full Text (PDF) Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Johns, H. E. Articles by Kornelsen, R. O. Search for Related Content PubMed PubMed Citation Articles by Johns, H. E. Articles by Kornelsen, R. O.

I. The Physical Aspects of Treatment of Cancer by 22 MeV X rays

H. E. Johns, Ph.D., Professor of Physics ^* E. K. Darby, M.Sc., Research Assistant and R. O. Kornelsen, B.Sc., Research Assistant

University of Saskatchewan and Saskatchewan Cancer Commission, Saskatoon, Sask., Canada ^* University of Saskatchewan, and Physicist to Saskatchewan Cancer Commission. Physics Department, University of Saskatchewan.

This excerpt was created in the absence of an abstract.

Recently a number of papers dealing with the use of betatron radiation in cancer therapy have been published by workers at the University of Illinois (Adams et al., 1948; Chase, Quastler, and Skaggs, 1947; Koch, Kerst, and Morrison, 1943; Luce, Quastler, and Skaggs, 1949; Quastler, 1945; Quastler and Clark, 1945; Quastler, et al. 1949; Quastler and Lanzl, L. H., 1950; Skaggs, Almy, Kerst, and Lanzl, L. H., 1950; Skaggs, Almy, Kerst, and Lanzl, L. H. 1948), in the General Electric (Charlton and Breed, 1948), at the University of Saskatchewan (Johns, Darby, Haslam, Katz, Harrington, 1949; Johns, Darby, Watson, Burkell, 1950), and in Great Britain (Fry, 1949; Mayneord, Martin, and Layne, 1949). The Illinois group have reported in detail (Quastler et al., 1949) on the first cancer treatment with the betatron. Since March 1949 the betatron in the Physics Department of the University of Saskatchewan has been used by Dr. T. A. Watson and Dr. C. C. Burkell of the Saskatchewan Cancer Commission in the treatment of over 50 patients suffering with advanced cancer. They have reported (Watson and Burkell, in publication) on the clinical findings for the first 36. This paper deals with some techniques developed for dosage control of betatron radiation.

When a high energy X-ray beam, free of stray electrons, falls on a scattering medium the surface dose is small. The dose rises to a maximum some distance below the surface where equilibrium is established between the primary and secondary radiation.