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

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
15042
Report Number(s):
ORNL/TM-1999/239
TRN: US0204512
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ADDITIVES; AMPLIFIERS; EFFICIENCY; ENERGY RESOLUTION; FISSILE MATERIALS; GAMMA RADIATION; PERFORMANCE; PREAMPLIFIERS; PROPORTIONAL COUNTERS; SENSITIVITY

Citation Formats

Hill, N.W., Miller, V.C., Valentine, T.E., and Williams, J.A. Operation of {sup 3}He Proportional Chambers in High Gamma Radiation Fields. United States: N. p., 1999. Web. doi:10.2172/15042.
Hill, N.W., Miller, V.C., Valentine, T.E., & Williams, J.A. Operation of {sup 3}He Proportional Chambers in High Gamma Radiation Fields. United States. doi:10.2172/15042.
Hill, N.W., Miller, V.C., Valentine, T.E., and Williams, J.A. Wed . "Operation of {sup 3}He Proportional Chambers in High Gamma Radiation Fields". United States. doi:10.2172/15042. https://www.osti.gov/servlets/purl/15042.
@article{osti_15042,
title = {Operation of {sup 3}He Proportional Chambers in High Gamma Radiation Fields},
author = {Hill, N.W. and Miller, V.C. and Valentine, T.E. and Williams, J.A.},
abstractNote = {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.},
doi = {10.2172/15042},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}