Abstract
A description is given of some measurements of the effective wavelength of the total and primary radiation reaching depths down to 15 cm. in a water phantom irradiated by beams of X rays. The effective wavelengths are determined by measuring the ratio of the ionizations in an “air-equivalent” and an aluminium lined chamber using a modified Kemp comparator, for which a new method of calibration is described. These measurements have been made for four primary radiations of H.V.L.s ranging from 0·49 to 2·4 mm. Cu, and for field areas up to 580 sq. cm. at 50 cm. F.S.D. From these measurements the wavelength of the scattered radiation is deduced and qualitative explanations of the phenomena observed are offered. The significance of the results for the conversion of doses measured in r to doses measured in ergs/gm. are pointed out and some applications to the case of bone are given.
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