Exposure calibration of a thimble chamber by calorimetric and ionimetric methods
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 /sup 137/Cs and /sup 60/Co photons. The calibration factor (roentgens per coulomb) at /sup 60/Co energy was 2% higher than an NPL, 2 MV 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 caviiy chamber measuremerts, at both /sup 137/Cs and /sup 60/ Co energies. (auth)
- Research Organization:
- Australian Atomic Energy Commission Research Establishment, Lucas Heights
- Sponsoring Organization:
- Sponsor not identified
- NSA Number:
- NSA-29-010215
- OSTI ID:
- 4935291
- Report Number(s):
- AAEC/E--283
- Country of Publication:
- Australia
- Language:
- English
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