Accession Number : AD0822914

Title :   ABSOLUTE DOSE MEASUREMENTS ON A MEGACURIE CO-60 SOURCE BY MEANS OF CALORIMETRY. A METHOD FOR CALIBRATION OF AQUEOUS CHEMICAL AND BIOLOGICAL SYSTEMS.

Descriptive Note : Research rept.,

Corporate Author : ARMY NATICK LABS MA FOOD DIV

Personal Author(s) : Holm, Niels W. ; Alexander, William B.

Report Date : DEC 1964

Pagination or Media Count : 63

Abstract : This report describes the use of a 10-ounce Thermos flask, filled with water, for absolute standardization of a Megacurie Co-60 source. Once the absorbed dose rate is established in a given position relative to the source, other aqueous solutions can be irradiated with an identical, and known, dose. The radiochemical (or radiobiological) yield can thus be readily determined. A short discussion is given on the concepts of radiation calorimetry, and experimental findings are reported for several modes of operating this particular device. It is shown that a set of electrical calibrations combined with a set of irradiations, both carried out in a constant temperature environment, can give complete information on the properties of the calorimeter and the absorbed dose rate. Furthermore, it is shown that once these properties are established, the calorimeter can be operated in a simplified adiabatic mode for determining the absorbed dose rate in other locations or sources. The accuracy of the method is discussed, and application of the system for calibration of chemical dosimeters is suggested. (Author)

Descriptors :   *RADIOACTIVE ISOTOPES), (*RADIATION DOSAGE, MEASUREMENT), (*COBALT, RADIOACTIVE ISOTOPES), (*CALORIMETRY, (*DOSIMETERS, CALIBRATION).

Subject Categories : Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE