Accession Number : ADA155069


Title :   Paired Ion Chamber Constants for Fission Gamma-Neutron Fields


Descriptive Note : Technical rept.


Corporate Author : ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD


Personal Author(s) : Ferlic, K. P. ; Zeman, G. H.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA155069


Report Date : DEC 1984


Pagination or Media Count : 33


Abstract : 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 TE/TE ion chamber, was taken to be unity for all spectra. The constant hU, which expresses gamma sensitivity of the C/CO2 ion chamber, was 0. 99 + or - 0.01(range) for all spectra. These calculations will serve as the basis for future dosimetry with the 50 cc ion chambers at the AFRRI TRIGA reactor.


Descriptors :   *IONIZATION CHAMBERS, SENSITIVITY, SPECTRA, CONSTANTS, GAMMA RAYS, CARBON DIOXIDE, GAMMA NEUTRON REACTIONS, NEUTRONS, KU BAND, FISSION NEUTRONS, DOSIMETRY, FISSION, NEUTRON SPECTRUM, ENERGY, PAIR PRODUCTION


Subject Categories : PARTICLE ACCELERATORS
      NUCLEAR PHYSICS & ELEMENTARY PARTICLE PHYSICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE