Calibration of intense /sup 60/Co gamma ray sources at the Savannah River Plant

Technical Report · Sat May 01 04:00:00 EDT 1976

DOI:https://doi.org/10.2172/7358058· OSTI ID:7358058

Bibler, N E

Three different dosimeters were used to calibrate Savannah River Plant /sup 60/Co sources having intensities greater than 10/sup 7/ rads/hr. These dosimeters are (a) ceric sulfate dissolved in 0.4M H/sub 2/SO/sub 4/, (b) oxalic acid dissolved in water, and (c) a commercially available nylon film containing a radiochromic dye. Response per unit dose to these dosimeters is independent of radiation intensity at 10/sup 4/ to 10/sup 11/ rads/hr. The dosimeters were calibrated at 6.0 x 10/sup 5/ rads/hr with a /sup 60/Co source whose intensity was determined with the standard Fricke dosimeter. For the sources at 10/sup 7/ rads/hr or greater, intensities were calculated from slopes of linear plots of dosimeter response versus irradiation time. Individual dose rates varied from 1.0 x 10/sup 7/ to 4.6 x 10/sup 7/ rads/hr. Each source was calibrated with at least two different dosimeters. Relative standard deviations varied from 2 to 9 percent. A conservative estimate of the uncertainty in the accuracy of these dosimeters is 10 percent. Of the three dosimeters, the nylon film is easiest to use and is therefore recommended for future calibrations.

• Research Organization: Du Pont de Nemours (E.I.) and Co., Aiken, S.C. (USA). Savannah River Lab.
• OSTI ID: 7358058
• Report Number(s): DP-1414
• Country of Publication: United States
• Language: English

Related Subjects

440102 -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
CALIBRATION
CARBOXYLIC ACIDS
CERIUM COMPOUNDS
CERIUM SULFATES
CHEMICAL DOSEMETERS
COLORIMETRIC DOSEMETERS
DICARBOXYLIC ACIDS
DOSE RATES
DOSEMETERS
GAMMA SOURCES
IRON COMPOUNDS
IRON SULFATES
MEASURING INSTRUMENTS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALIC ACID
OXYGEN COMPOUNDS
RADIATION SOURCES
RARE EARTH COMPOUNDS
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS