Characteristics of A-150 plastic-equivalent gas in A-150 plastic ionization chambers for p(66)Be(49) neutrons
The evaluation of a gas mixture having an atomic composition similar to that of A-150 tissue-equivalent (TE) plastic has been extended to a high-energy neutron therapy beam. ''A-150'' gas, air, and methane-based TE gas were each flowed through A-150 plastic-walled ion chambers of different sizes and irradiated with p(66)Be(49) neutrons. A tentative value for W-bar(A-150) of 27.3 +- 0.5 JC/sup -1/ was derived for this beam. The W-bar value of the A-150 gas mixture is compared to those of methane-based TE gas and of air for the p(66)Be(49) neutron beam as well as to corresponding values found in similar experiments using 14.8-MeV monoenergetic neutrons. Key words: gas mixture, ion chamber, TE gas, W-bar, neutrons, dosimetry
- Research Organization:
- Neutron Therapy Facility Fermilab, Batavia, Illinois 60510
- DOE Contract Number:
- AC02-76EV01105
- OSTI ID:
- 6657310
- Journal Information:
- Med. Phys.; (United States), Vol. 9:6
- Country of Publication:
- United States
- Language:
- English
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Characteristics of A-150 plastic equivalent gas in A-150 plastic ionization chambers for p(66)Be(49) neutrons
Characteristics of A-150 plastic-equivalent gas in A-150 plastic ionization chambers for p(66)Be(49) neutrons
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NEUTRON BEAMS
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655003* - Medical Physics- Dosimetry