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Title: Single-channel beta-gamma coincidence detection of radioactive xenon using digital pulse shape analysis of phoswich detector signals

Abstract

Monitoring radioactive xenon in the atmosphere is one of several methods used to detect nuclear weapons testing. To increase sensitivity, monitoring stations use a complex system of separate beta and gamma detectors to detect beta-gamma coincidences from the Xe isotopes of interest, which is effective but requires such careful gain matching and calibration that it is difficult to operate in the field. To simplify the system, a phoswich detector has been designed, consisting of optically coupled plastic and CsI scintillators to absorb beta particles and gamma rays, respectively. Digital pulse shape analysis (PSA) of the detector signal is used to determine if radiation interacted in either or both parts of the detector and to measure the energy deposited in each part, thus using only a single channel of readout electronics to detect beta-gamma coincidences and to measure both energies. Experiments with a prototype detector show that the technique can clearly separate event types, does not degrade the energy resolution, and has an error rate for detecting coincidences of less than 0.1%. Monte Carlo simulations of radiation transport and light collection in the proposed detector were performed to obtain optimum values for its design parameters and an estimate of the coincidencemore » detection efficiency (82%-92%) and the background rejection rate (better than 99%).« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
885201
Report Number(s):
PNWD-SA-7428
Journal ID: ISSN 0018-9499; IETNAE; TRN: US200616%%381
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science; Journal Volume: 53; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; BETA PARTICLES; CALIBRATION; DESIGN; DETECTION; EFFICIENCY; ENERGY RESOLUTION; MONITORING; NUCLEAR WEAPONS; PHOSPHORS; PLASTICS; RADIATION TRANSPORT; RADIATIONS; SENSITIVITY; SHAPE; TESTING; XENON; beta-gamma coincidence detection; digital pulse shape analysis; phoswich detector; radioxenon monitoring

Citation Formats

Hennig, Wolfgang, Tan, Hui, Warburton, William K., and McIntyre, Justin I. Single-channel beta-gamma coincidence detection of radioactive xenon using digital pulse shape analysis of phoswich detector signals. United States: N. p., 2006. Web. doi:10.1109/TNS.2006.870447.
Hennig, Wolfgang, Tan, Hui, Warburton, William K., & McIntyre, Justin I. Single-channel beta-gamma coincidence detection of radioactive xenon using digital pulse shape analysis of phoswich detector signals. United States. doi:10.1109/TNS.2006.870447.
Hennig, Wolfgang, Tan, Hui, Warburton, William K., and McIntyre, Justin I. Sat . "Single-channel beta-gamma coincidence detection of radioactive xenon using digital pulse shape analysis of phoswich detector signals". United States. doi:10.1109/TNS.2006.870447.
@article{osti_885201,
title = {Single-channel beta-gamma coincidence detection of radioactive xenon using digital pulse shape analysis of phoswich detector signals},
author = {Hennig, Wolfgang and Tan, Hui and Warburton, William K. and McIntyre, Justin I.},
abstractNote = {Monitoring radioactive xenon in the atmosphere is one of several methods used to detect nuclear weapons testing. To increase sensitivity, monitoring stations use a complex system of separate beta and gamma detectors to detect beta-gamma coincidences from the Xe isotopes of interest, which is effective but requires such careful gain matching and calibration that it is difficult to operate in the field. To simplify the system, a phoswich detector has been designed, consisting of optically coupled plastic and CsI scintillators to absorb beta particles and gamma rays, respectively. Digital pulse shape analysis (PSA) of the detector signal is used to determine if radiation interacted in either or both parts of the detector and to measure the energy deposited in each part, thus using only a single channel of readout electronics to detect beta-gamma coincidences and to measure both energies. Experiments with a prototype detector show that the technique can clearly separate event types, does not degrade the energy resolution, and has an error rate for detecting coincidences of less than 0.1%. Monte Carlo simulations of radiation transport and light collection in the proposed detector were performed to obtain optimum values for its design parameters and an estimate of the coincidence detection efficiency (82%-92%) and the background rejection rate (better than 99%).},
doi = {10.1109/TNS.2006.870447},
journal = {IEEE Transactions on Nuclear Science},
number = 2,
volume = 53,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}