Abstract
In a previous communication (1) the basic principles of contact irradiation therapy were indicated, with an outline of possible uses for this particular method of treatment. After a lapse of nearly five years, during which period contact therapy has been constantly employed, it may be useful to review briefly these basic principles and to enumerate the pathological conditions in which it has been found most useful, together with the results obtained. It is doubtful that the effect of radiant energy depends on its wave length. It seems likely (particularly in the light of the experience herein set forth) that it depends upon the total energy absorbed per cubic centimeter of tissue and the time spacing of the doses or the fractionation of the total energy. The essential conditions to be fulfilled are: (1) a short distance between the surface and the source of the radiation and (2) a consequent absorption of a large amount of energy in the first few centimeters of tissue. These conditions are met by the appa...
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