THE G VALUE AND THE REPRODUCIBILITY OF THE FERROUS-FERRIC DOSIMETER

Technical Report · Tue Oct 01 04:00:00 EDT 1963

OSTI ID:4110684

Whittaker, B

Experimental work was carried out to estimate the overall reproducibility of the ferrous sulfate method of radiation dosimetry. The work was divided equally between two separate laboratories using different spectrophotometers. It was shown that the ferric extinction coefficients for the two instruments differed by 2.3%. Correcting for the difference in extinction coefficients, it was shown that the overall reproducibility was plus or minus 2% in an experiment involving 128 dosimeters, eight different ferrous solutions, and four separate irradiations at temperatures in the range 16.8 to 31.0 deg C. Ferric radiation yield (G) values were determined using calorimetric techniques. Isothermal calorimeters were employed, the absorbers being of graphite or aluminum so as to avoid errors due to chemical energy losses. The resulting values of G ranged from 14.8 plus or minus 0.1 to 15.4 plus or minus 0.1. Possible sources of error in the graphite calorimeter are discussed. The G value results are shown to depend to some extent on the nature and internal dimensions of the ampoules used to contain the ferrous solutions. (auth)

• Research Organization: United Kingdom Atomic Energy Authority. Research Group. Wantage Research Lab., Wantage, Berks, England
• NSA Number: NSA-18-007027
• OSTI ID: 4110684
• Report Number(s): AERE-R-3073
• Country of Publication: United Kingdom
• Language: English

Related Subjects

ABSORPTION
ALUMINUM
CALORIMETERS
CHEMICAL RADIATION DETECTORS
DOSEMETERS
G-VALUE
GRAPHITE
INSTRUMENTATION
IRON SULFATES
PERFORMANCE
RADIATION CHEMISTRY
SOLUTIONS
TEMPERATURE