Application of A150-plastic equivalent gases in microdosimetric measurements
Neutron dosimetry measurements with ionization chambers, for the most part, employ tissue equivalent plastic-walled cavities (Shonka A150) filled with either air or a methane-base tissue-like gas. The atomic composition of TE-gas and A150 plastic are not matched and are quite dissimilar from muscle. Awschalom and Attix (1980) have partially resolved the problem by formulating a novel A150-plastic equivalent gas. This establishes a homogeneous wall-gas cavity dosimeter for neutron measurements and confines the necessary corrections to the applications of kerma ratios. In this report, we present measurements of applications of two A150-plastic equivalent gases in a low pressure spherical proportional counter. Gas gains and alpha-particle resolutions were determined. For these A150-mixtures as well as a methane-based TE-gas and an Ar-CO/sub 2/ mixture, we report measurements of event size distributions from exposure to a beam of 14.8 MeV neutrons.
- Research Organization:
- Wisconsin Univ., Madison (USA). Dept. of Medical Physics
- DOE Contract Number:
- AS02-76EV01105
- OSTI ID:
- 5456213
- Report Number(s):
- DOE/EV/01105-284; ON: DE82009368; TRN: 82-011938
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEUTRON DOSIMETRY
IONIZATION CHAMBERS
TISSUE-EQUIVALENT MATERIALS
FAST NEUTRONS
GASES
KERMA
MICRODOSIMETRY
BARYONS
DOSIMETRY
ELEMENTARY PARTICLES
FERMIONS
FLUIDS
HADRONS
MATERIALS
MEASURING INSTRUMENTS
NEUTRONS
NUCLEONS
RADIATION DETECTORS
655003* - Medical Physics- Dosimetry
654003 - Radiation & Shielding Physics- Neutron Interactions with Matter