THE DIRECT MEASUREMENT OF LOCAL ABSORBED DOSE BY CALORIMETRY. INVESTIGATION OF THE RELATION BETWEEN THE ENERGY ABSORBED IN A MEDIUM EXPOSED TO X-RAYS AND ELECTRONS, THE IONIZATION PRODUCED IN A GAS CAVITY CHAMBER IN THE SAME ABSORBING MEDIUM, AND THE OXIDATION OF FERROUS SULFATE IN THE FRICKE DOSIMETER. Annual Progress Report for July 1, 1959-June 30, 1960

Technical Report · Mon Aug 01 04:00:00 EDT 1960

OSTI ID:4140728

Laughlin, J S

Design and construction of an absorbed-dose calorimeter fabricated of pure carbon were completed. Measurements of the absorbed dose in carbon from a Co/sup 60/ gamma-ray beam and from 250 and 150 Kvcp x rays were completed. Parallel chemical and-ionization measurements were made for these radiations. The G value for oxidation of ferrous sulfate in the Fricke dosimeter by Co/sup 60/ gamma rays was determined on the basis of these measurements to be 15.24 plus or minus 1.2% ferric ions per 100 ev. The existence of a chemical correction in irradiated polyethylene was confirmed by these measurements. With Co/sup 60/ gamma rays, W for air was determined to be 34.9 ev per ion pair plus or minus 0.9%. Data for the 250 and 150 Kvcp x-ray irradiations are now being processed. (auth)

• Research Organization: Sloan-Kettering Inst. for Cancer Research, New York
• NSA Number: NSA-14-025650
• OSTI ID: 4140728
• Report Number(s): TID-6534
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
AIR
ANIONS
CALORIMETERS
CARBON
CATIONS
CHEMICAL RADIATION DETECTORS
COBALT 60
DOSEMETERS
ENERGY
ENERGY LEVELS
ENGINEERING AND EQUIPMENT
G-VALUE
GAMMA RADIATION
IONIZATION
IRON
IRON SULFATES
IRRADIATION
MEASURED VALUES
OXIDATION
PLANNING
POLYETHYLENES
RADIATION CHEMISTRY
RADIATION DOSES
X RADIATION