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Title: A Software Package Using a Mesh-grid Method for Simulating HPGe Detector Efficiencies

Abstract

Traditional ways of determining the absolute full-energy peak efficiencies of high-purity germanium (HPGe) detectors are often time consuming, cost prohibitive, or not feasible. A software package, KMESS (Kevin’s Mesh Efficiency Simulator Software), was developed to assist in predicting these efficiencies. It uses a semiempirical mesh-grid method and works for arbitrary source shapes and counting geometries. The model assumes that any gamma-ray source shape can be treated as a large enough collection of point sources. The code is readily adaptable, has a web-based graphical front-end, and could easily be coupled to a 3D scanner. As will be shown, this software can estimate absolute full-energy peak efficiencies with good accuracy in reasonable computation times. It has applications to the field of gamma-ray spectroscopy because it is a quick and accurate way to assist in performing quantitative analyses using HPGe detectors.

Authors:
Publication Date:
Research Org.:
National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NA)
OSTI Identifier:
969333
Report Number(s):
DOE/NV/25946-686
Journal ID: ISSN 0236-5731; JRNCDM; TRN: US1000927
DOE Contract Number:
DE-AC52-06NA25946
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Radioanalytical and Nuclear Chemistry; Journal Volume: 282; Journal Issue: 1; Conference: Methods and Applications of Radioanalytical Chemistry VIII (MARC VIII) Conference; Kailua-Kona, Hawaii; April 5-10, 2009
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; CHEMISTRY; EFFICIENCY; GERMANIUM; POINT SOURCES; SHAPE; SIMULATORS; SPECTROSCOPY; COMPUTER CODES; PROGRAMMING; germanium detector, HPGe, efficiency

Citation Formats

Kevin Jackman. A Software Package Using a Mesh-grid Method for Simulating HPGe Detector Efficiencies. United States: N. p., 2009. Web. doi:10.1007/s10967-009-0246-9.
Kevin Jackman. A Software Package Using a Mesh-grid Method for Simulating HPGe Detector Efficiencies. United States. doi:10.1007/s10967-009-0246-9.
Kevin Jackman. 2009. "A Software Package Using a Mesh-grid Method for Simulating HPGe Detector Efficiencies". United States. doi:10.1007/s10967-009-0246-9.
@article{osti_969333,
title = {A Software Package Using a Mesh-grid Method for Simulating HPGe Detector Efficiencies},
author = {Kevin Jackman},
abstractNote = {Traditional ways of determining the absolute full-energy peak efficiencies of high-purity germanium (HPGe) detectors are often time consuming, cost prohibitive, or not feasible. A software package, KMESS (Kevin’s Mesh Efficiency Simulator Software), was developed to assist in predicting these efficiencies. It uses a semiempirical mesh-grid method and works for arbitrary source shapes and counting geometries. The model assumes that any gamma-ray source shape can be treated as a large enough collection of point sources. The code is readily adaptable, has a web-based graphical front-end, and could easily be coupled to a 3D scanner. As will be shown, this software can estimate absolute full-energy peak efficiencies with good accuracy in reasonable computation times. It has applications to the field of gamma-ray spectroscopy because it is a quick and accurate way to assist in performing quantitative analyses using HPGe detectors.},
doi = {10.1007/s10967-009-0246-9},
journal = {Journal of Radioanalytical and Nuclear Chemistry},
number = 1,
volume = 282,
place = {United States},
year = 2009,
month =
}
  • Traditional ways of determining the absolute full-energy peak efficiencies of high-purity germanium (HPGe) detectors are often time consuming, cost prohibitive, or not feasible. A software package, KMESS (Kevin's Mesh Efficiency Simulator Software), was developed to assist in predicting these efficiencies. It uses a semiempirical mesh-grid method and works for arbitrary source shapes and counting geometries. The model assumes that any gamma-ray source shape can be treated as a large enough collection of point sources. The code is readily adaptable, has a web-based graphical front-end. and could easily be coupled to a 3D scanner. As will be shown. this software canmore » estimate absolute full-energy peak efficiencies with good accuracy in reasonable computation times. It has applications to the field of gamma-ray spectroscopy because it is a quick and accurate way to assist in performing quantitative analyses using HPGe detectors.« less
  • This paper evaluates the ANGLE(reg sign) software package, an advanced efficiency calibration software for high purity germanium detectors that is distributed by ORTEC(reg sign). ANGLE(reg sign) uses a semi-empirical approach, by way of the efficiency transfer method, based on the calculated effective solid angle. This approach would have an advantage over the traditional relative and stochastic methods by decreasing the chances for systematic errors and reducing sensitivity to uncertainties in detector parameters. For experimental confirmation, a closed-end coaxial HPGe detector was used with sample geometries frequently encountered at the Los Alamos National Laboratory. The results obtained were sufficient for detector-sourcemore » configurations which included intercepting layers of plexiglass and carbon graphite, but somewhat insufficient for bare source configurations.« less
  • Using a grid bias method for plasma parameter control, volume production of hydrogen negative ions H{sup -} is studied in pure hydrogen rf plasmas. Relationship between the extracted H{sup -} ion currents and plasma parameters is discussed. It is confirmed that both high and low electron temperature T{sub e} plasmas are produced in the separated regions when the grid is negatively biased. In addition, with changing grid potential V{sub g}, values of n{sub e} increase while T{sub e} decrease in their values. The negative ion production depends strongly on the grid potential and related plasma conditions.
  • Using a mesh grid bias method for plasma parameter control, volume production of hydrogen negative ions H{sup -} is studied in pure hydrogen rf plasmas. Relationship between the extracted H{sup -} ion currents and plasma parameters is discussed. Both high and low electron temperature T{sub e} plasmas are produced in the separated regions when the grid is negatively biased. In addition, with changing grid potential V{sub g}, values of n{sub e} increase while T{sub e} decrease in their values. The negative ion production depends strongly on the grid potential and related plasma conditions. It is also confirmed that grid biasmore » method is more effective than the so-called magnetic filter method to optimize plasma parameters for H{sup -} production. Production of deuterium negative ions D{sup -} is also studied briefly.« less
  • A highly segmented coaxial HPGe detector was operated in a low background counting facility for over 1 year to experimentally evaluate possible segmentation strategies for the proposed Majorana neutrino-less double-beta decay experiment. Segmentation schemes were evaluated on their ability to reject multi-segment events while retaining single-segment events. To quantify a segmentation scheme's acceptance efficiency the percentage of peak area due to single segment events was calculated for peaks located in the energy region 911-2614 keV. Single interaction site events were represented by the double-escape peak from the 2614 keV decay in {sup 208}Tl located at 1592 keV. In spite ofmore » its prototypical nature, the detector performed well under realistic operating conditions and required only minimal human interaction. Though the energy resolution for events with interactions in multiple segments was impacted by inter-segment cross-talk, the implementation of a cross-talk correlation matrix restored acceptable resolution. Additionally, simulations utilizing the MaGe simulation package were performed and found to be in good agreement with experimental observations verifying the external nature of the background radiation.« less