Use of MCNPX for Alpha Spectrometry Simulations of a Continuous Air Monitor

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The purpose of this study was to determine if the alpha energy spectrum in a Passive Implanted Planar Silicon (PIPS) detector, as modeled by MCNPX [1], can be used to design a radon stripping algorithm for a continuous air monitor (CAM). This stripping algorithm would be employed to discriminate naturally occurring radioisotopes from the anthropogenic for nuclear safety -related applications. It is hoped that using an algorithm based on MCNPX simulations, the CAM will not be prone to false alarms when radon levels are dynamic as identified in other CAM systems [2,3]. This work is focused on the design of ... continued below

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631-633

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Robert Hayes, Craig Marianno January 1, 2007.

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Description

The purpose of this study was to determine if the alpha energy spectrum in a Passive Implanted Planar Silicon (PIPS) detector, as modeled by MCNPX [1], can be used to design a radon stripping algorithm for a continuous air monitor (CAM). This stripping algorithm would be employed to discriminate naturally occurring radioisotopes from the anthropogenic for nuclear safety -related applications. It is hoped that using an algorithm based on MCNPX simulations, the CAM will not be prone to false alarms when radon levels are dynamic as identified in other CAM systems [2,3]. This work is focused on the design of the next generation air particulate detector (NGAPD) for the United States Navy. The primary isotope of interest is Co-60. This radionuclide emits a beta with an average energy of 96 keV. Therefore, once deposited on the CAM filter, it will produce a beta continuum seen by the PIPS detector. In addition, as radon progeny is deposited on the air filter, these will give rise to characteristic alpha peaks and a beta continuum. This is primarily an issue in port-or land-based applications. Ultimately, measurement of a radon alpha spectrum is desired to predict the amount of beta activity which would be measured from the radon progeny decay chains. All excess beta activity could then be attributed to anthropogenic sources once the radon progeny contributions have been stripped out.

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631-633

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  • Journal Name: Transactions of the American Nuclear Society; Journal Volume: 96; Conference: American Nuclear Society Annual Meeting; Boston, MA; June 24-28, 2007

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  • Report No.: DOE/NV/25946--106
  • Grant Number: DE-AC52-06NA25946
  • Office of Scientific & Technical Information Report Number: 946313
  • Archival Resource Key: ark:/67531/metadc898716

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  • January 1, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 16, 2016, 12:53 p.m.

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Robert Hayes, Craig Marianno. Use of MCNPX for Alpha Spectrometry Simulations of a Continuous Air Monitor, article, January 1, 2007; (digital.library.unt.edu/ark:/67531/metadc898716/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.