Paired Ion Chamber Constants for Fission Gamma-Neutron Fields
ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
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Paired ionization chamber constants are calculated for the 50 cc spherical ionization chambers used in dosimetry of the AFRRI TRIGA reactor. The calculations include the most recently available information on energy spectra for neutron and gamma radiation present in AFRRI reactor exposure rooms, as well as for kerma factors and W-values of neutrons. The constant kT, which expresses neutron sensitivity of the 50 cc tissue equivalent TE ion chamber filled with TE gas, ranged from 0.92 to 0.96 among the 18 different neutron spectra for which calculations were done. The constant kU, which expresses neutron sensitivity of the 50 cc graphite ion chamber filled with CO2, ranged from 0.07 to 0.11 among the same spectra. The constant hT, which expresses gamma sensitivity of the TETE ion chamber, was taken to be unity for all spectra. The constant hU, which expresses gamma sensitivity of the CCO2 ion chamber, was 0. 99 or - 0.01range for all spectra. These calculations will serve as the basis for future dosimetry with the 50 cc ion chambers at the AFRRI TRIGA reactor.
- Particle Accelerators
- Nuclear Physics and Elementary Particle Physics