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Operation of {sup 3}He Proportional Chambers in High Gamma Radiation Fields

By N.W. Hill, V.C. Miller, T.E. Valentine and J.A. Williams

Abstract

Operation of {sup 3}He proportional chambers with irradiated fissile materials is limited because of the sensitivity of these chambers to gamma ray events. The optimum performance of these chambers is achieved with proper selection of an additive gas to the chambers and with proper choice of preamplifier and linear amplifier time constants. The counting efficiency of a 4-atm, {sup 3}He-CO2 chamber is improved from 35% to 43% in a 200 R/hr gamma radiation field by decreasing the linear amplifier time constant. Likewise, the counting efficiency of a 1-atm, {sup 3}He-CF4 is improved from 11% to 14% in a 200 R/hr gamma radiation field by decreasing the linear amplifier time constant. The 4-atm, {sup 3}He-CO2 1-in.-OD chamber has a higher efficiency than the 1-atm, {sup 3}He-CF4 1-in.-OD chamber although the energy resolution of the 3 He-CF4 chamber is better than that for the {sup 3}He-CO2 chamber

Topics: Energy Resolution, 46 Instrumentation Related To Nuclear Science And Technology, Sensitivity, Fissile Materials, Efficiency, 11 Nuclear Fuel Cycle And Fuel Materials, Gamma Radiation, Proportional Counters, Preamplifiers, Amplifiers, Additives, Performance
Publisher: Oak Ridge National Laboratory
Year: 1999
DOI identifier: 10.2172/15042
OAI identifier:
Provided by: UNT Digital Library
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