Annual Report on Research Project: Radiological Research Laboratory, Columbia University
Abstract
Work was continued on dosimetric measurements of different types of ionizing radiation and the determination of related quantities of radiation. A tissue equivalent spherical proportional counter and associated apparatus were developed for use in measurements of the doses delivered by monoenergetic neutrons. A standard tissue equivalent gas ionization chamber was developed for use in the calibration of thimble chamber dosimeters in terms of absorbed dose in any tissue or material of interest. A lead paint containing 88% of finely powdered lead was developed to improve the shielding of existing low voltage machines without structural changes. Progress is reported in the following studies: the mechanism of spontaneous and radiation-induced mutations in E. coli; ionization measurement of the average beta-ray energy of iodine-131; factors inhibiting bacterial multiplication; differences in vitamin B12 binding capacity of normal and irradiated plasma; the effectiveness of cysteine ointment in the treatment of radiation injuries of the skin; studies on the aging process in which emphasis was placed on the relation between mortality rate and spontaneous mutation rate and on the effects of low-level chronic radiation exposure on the life span of mice; and studies on the pathological effects of ionizing radiations on the developing fetus. A list is included of publications during the period and papers in press. (For preceding period see NYO-2081.)
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