Accession Number : AD0731709

Title :   Ionization in Microscopic Volumes Irradiated by Energetic Photons.

Descriptive Note : Final rept.,

Corporate Author : OREGON STATE UNIV CORVALLIS RADIATION CENTER

Personal Author(s) : Braby,Leslie A. ; Ellett,William H.

Report Date : 10 OCT 1971

Pagination or Media Count : 166

Abstract : The energy absorbed by microscopic volumes exposed to ionizing radiation is not well represented by the average dose due to the small number of discrete energy transfers involved. The energy deposited in a microscopic volume can be determined by measuring the ionization in a detector filled with gas at low pressure. A grid-walled spherical proportional counter suitable for making such measurements for photon irradiation is described and compared to a solid-walled counter. Measured ionization distributions are presented for 60Co gamma irradiation, filtered and unfiltered 250 kVp x-rays, and for 65 kVp x-rays. Other distributions which may be of use in understanding radiation damage models are calculated from these measured distributions. (Author)

Descriptors :   (*RADIATION EFFECTS, *GAMMA RAYS), (*X RAYS, RADIATION EFFECTS), IONIZATION, PHOTONS, COBALT, RADIOBIOLOGY, STATISTICAL DISTRIBUTIONS, PROPORTIONAL COUNTERS, DOSE RATE, CURVE FITTING, THESES

Subject Categories : Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE