Accession Number:

ADA995250

Title:

OPERATION GREENHOUSE. Scientific Director's Report. Annex 5.1 - Annex A. Alkali Halide and Phosphate Glass Radiological Casualty Dosimeters,

Descriptive Note:

Corporate Author:

NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA

Report Date:

1951-07-01

Pagination or Media Count:

40.0

Abstract:

Photochemical reactions induced by ionizing radiations can produce color centers in alkali halide crystals and fluorescent centers in silver-bearing phosphate glasses. These reactions are being investigated as a basis for casualty-badge radiation dosimeters. Potassium bromide and potassium chloride crystals were satisfactorily sensitized by heating in a combined atmosphere of alkali vapor and hydrogen. Doses of 25 r of cobalt 60 gamma rays were detected by the visible color changes in sensitized KBr and KCl. The sensitivity of the phosphate glass is comparable to the crystals however, a reading device is needed for the fluorescent measurements. The crystals and glasses are strongly energy dependent for X-ray energies below about 150-kv effective. In a test atomic bomb detonation the crystals and glasses were exposed to total dosages of 17 to 4,460 r at varying dosage rates. In general, there was a good agreement among the dosage readings for samples of a given material but the readings for different materials varied from 0.81 to 2.3 times the readings obtained with National Bureau of Standards NBS film badges.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE