Dependence of charge collection distributions and dose on the gas type filling the ionization chamber for a p(66)Be(49) clinical neutron beam

Technical Report · Tue Jan 01 00:00:00 EST 1985

DOI:https://doi.org/10.2172/5345986· OSTI ID:5345986

Awschalom, M; Haken, R K.T.

Measurements of central axis depth charge distributions (CADCD) in a p(66)Be(49) clinical neutron beam using A-150 TE plastic ionization chambers (IC) have shown that these distributions are dependent on the gas type filling the ICs. IC volumes from 0.1 to 8 cm/sup 3/ and nine different gases were investigated. Off axis ratios and build-up measurements do not seem to be as sensitive to gas type. The gas dosimetry constants given in the AAPM Protocol for Neutron Beam Dosimetry for air and methane based TE gases were tested for consistency in water and in TE solution filled phantoms at depths of 10 cm, when used in conjunction with an IC having 5 mm thick walls of A-150. 29 refs., 7 figs., 1 tab.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 5345986
• Report Number(s): FNAL-TM-1296; ON: DE85017366
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
IONIZATION CHAMBERS
DEPTH DOSE DISTRIBUTIONS
EXPERIMENTAL DATA
GASES
NEUTRON DOSIMETRY
PHANTOMS
RESPONSE MODIFYING FACTORS
TISSUE-EQUIVALENT MATERIALS
DATA
DOSIMETRY
FLUIDS
INFORMATION
MATERIALS
MEASURING INSTRUMENTS
MOCKUP
NUMERICAL DATA
RADIATION DETECTORS
RADIATION DOSE DISTRIBUTIONS
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
655003* - Medical Physics- Dosimetry
440102 - Radiation Instrumentation- Radiation Dosemeters