Application of A150-plastic equivalent gases in microdosimetric measurements

Technical Report · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/5456213· OSTI ID:5456213

DeLuca, Jr., P. M.; Higgins, P. D.; Pearson, D. W.; Schell, M.; Attix, F. H.

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
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
654003 -- Radiation & Shielding Physics-- Neutron Interactions with Matter
655003* -- Medical Physics-- Dosimetry
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
DOSIMETRY
ELEMENTARY PARTICLES
FAST NEUTRONS
FERMIONS
FLUIDS
GASES
HADRONS
IONIZATION CHAMBERS
KERMA
MATERIALS
MEASURING INSTRUMENTS
MICRODOSIMETRY
NEUTRON DOSIMETRY
NEUTRONS
NUCLEONS
RADIATION DETECTORS
TISSUE-EQUIVALENT MATERIALS