Abstract
RADIATION therapy is very much in need of practical methods for comparing the output of different X-ray machines. It is essential that every installation be checked up occasionally so that its users may have assurance that the output is constant as well as know how it compares with the installations of other workers. Quality and quantity are the things about which a testing apparatus for X-rays should give data, since they are used for the comparison of different installations. Only a method which measures the terminal, or end, product can be employed to give unimpeachable data for determining such factors. Depth dose for specified conditions of aperture and distance, when once worked out for some one effective wave length, always remains the same for that equivalent spectrum. That is axiomatic. Consequently any apparatus which will give data for securing the quantity and effective wave length will then serve for determining the depth dose, when the so-called Dessauer charts are given for effective wave l...
Published Version
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