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Title: Exposure calibration of a thimble chamber by calorimetric and ionimetric methods.
Authors: Urquhart, DF
Johnson, EP
Badger, WS
Keywords: Radiation doses
Cobalt 60
Cesium 137
Comparative evaluations
Issue Date: Aug-1973
Publisher: Australian Atomic Energy Commission
Citation: Urquhart, D. F., Johnson, E. P, & Badger, W. S. (1973). Exposure calibration of a thimble chamber by calorimetric and ionimetric methods (AAEC/E283). Lucas Heights N.S.W.: Australian Atomic Energy Commission, Research Establishment.
Abstract: A Baldwin-Farmer thimble chamber, fitted with a perspex build-up cap was calibrated against an absolute graphite cavity chamber to provide an interim working standard of exposure for 137Cs and 60Co photons. The calibration factor (roentgens per coulomb) at 60Co energy was 2% higher than an NPL. 2MV calibration for this chamber, carried out in the UK by the National Physical Laboratory. The thimble chamber, fitted with an aluminium build-up cap, was also used to make a comparison between the graphite cavity chamber and an aluminium micro-calorimeter which is to be used as an interim absorbed dose standard. Exposure calibration factors for the thimble chamber derived from calorimeter measurements were in good agreement with calibration factors derived from cavity chamber measurements, at both 137Cs and 60Co energies.
Gov't Doc #: 490
ISBN: 0642995974
Appears in Collections:Scientific and Technical Reports

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