Spectral correction factors for conventional neutron dose meters used in high-energy neutron environments—improved and extended results based on a complete survey of all neutron spectra in IAEA-TRS-403

U. Oparaji, Y.H. Tsai, Y.C. Liu, K.W. Lee, E. Patelli, R.J. Sheu

Research output: Contribution to journalArticle

Abstract

This paper presents improved and extended results of our previous study on corrections for conventional neutron dose meters used in environments with high-energy neutrons (En > 10 MeV). Conventional moderated-type neutron dose meters tend to underestimate the dose contribution of high-energy neutrons because of the opposite trends of dose conversion coefficients and detection efficiencies as the neutron energy increases. A practical correction scheme was proposed based on analysis of hundreds of neutron spectra in the IAEA-TRS-403 report. By comparing 252Cf-calibrated dose responses with reference values derived from fluence-to-dose conversion coefficients, this study provides recommendations for neutron field characterization and the corresponding dose correction factors. Further sensitivity studies confirm the appropriateness of the proposed scheme and indicate that (1) the spectral correction factors are nearly independent of the selection of three commonly used calibration sources: 252Cf, 241Am-Be and 239Pu-Be; (2) the derived correction factors for Bonner spheres of various sizes (6”−9”) are similar in trend and (3) practical high-energy neutron indexes based on measurements can be established to facilitate the application of these correction factors in workplaces.
LanguageEnglish
Pages1-9
Number of pages9
JournalJournal of Radiation Protection Dosimetry
Volume175
Issue number1
DOIs
Publication statusPublished - 21 Sep 2016

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neutron spectra
neutrons
dosage
energy
trends
coefficients
recommendations
fluence
sensitivity

Keywords

  • neutron dose meters
  • high-energy neutrons
  • dose correction factors

Cite this

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title = "Spectral correction factors for conventional neutron dose meters used in high-energy neutron environments—improved and extended results based on a complete survey of all neutron spectra in IAEA-TRS-403",
abstract = "This paper presents improved and extended results of our previous study on corrections for conventional neutron dose meters used in environments with high-energy neutrons (En > 10 MeV). Conventional moderated-type neutron dose meters tend to underestimate the dose contribution of high-energy neutrons because of the opposite trends of dose conversion coefficients and detection efficiencies as the neutron energy increases. A practical correction scheme was proposed based on analysis of hundreds of neutron spectra in the IAEA-TRS-403 report. By comparing 252Cf-calibrated dose responses with reference values derived from fluence-to-dose conversion coefficients, this study provides recommendations for neutron field characterization and the corresponding dose correction factors. Further sensitivity studies confirm the appropriateness of the proposed scheme and indicate that (1) the spectral correction factors are nearly independent of the selection of three commonly used calibration sources: 252Cf, 241Am-Be and 239Pu-Be; (2) the derived correction factors for Bonner spheres of various sizes (6”−9”) are similar in trend and (3) practical high-energy neutron indexes based on measurements can be established to facilitate the application of these correction factors in workplaces.",
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Spectral correction factors for conventional neutron dose meters used in high-energy neutron environments—improved and extended results based on a complete survey of all neutron spectra in IAEA-TRS-403. / Oparaji, U.; Tsai, Y.H.; Liu, Y.C.; Lee, K.W.; Patelli, E.; Sheu, R.J.

Vol. 175, No. 1, 21.09.2016, p. 1-9.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Spectral correction factors for conventional neutron dose meters used in high-energy neutron environments—improved and extended results based on a complete survey of all neutron spectra in IAEA-TRS-403

AU - Oparaji, U.

AU - Tsai, Y.H.

AU - Liu, Y.C.

AU - Lee, K.W.

AU - Patelli, E.

AU - Sheu, R.J.

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N2 - This paper presents improved and extended results of our previous study on corrections for conventional neutron dose meters used in environments with high-energy neutrons (En > 10 MeV). Conventional moderated-type neutron dose meters tend to underestimate the dose contribution of high-energy neutrons because of the opposite trends of dose conversion coefficients and detection efficiencies as the neutron energy increases. A practical correction scheme was proposed based on analysis of hundreds of neutron spectra in the IAEA-TRS-403 report. By comparing 252Cf-calibrated dose responses with reference values derived from fluence-to-dose conversion coefficients, this study provides recommendations for neutron field characterization and the corresponding dose correction factors. Further sensitivity studies confirm the appropriateness of the proposed scheme and indicate that (1) the spectral correction factors are nearly independent of the selection of three commonly used calibration sources: 252Cf, 241Am-Be and 239Pu-Be; (2) the derived correction factors for Bonner spheres of various sizes (6”−9”) are similar in trend and (3) practical high-energy neutron indexes based on measurements can be established to facilitate the application of these correction factors in workplaces.

AB - This paper presents improved and extended results of our previous study on corrections for conventional neutron dose meters used in environments with high-energy neutrons (En > 10 MeV). Conventional moderated-type neutron dose meters tend to underestimate the dose contribution of high-energy neutrons because of the opposite trends of dose conversion coefficients and detection efficiencies as the neutron energy increases. A practical correction scheme was proposed based on analysis of hundreds of neutron spectra in the IAEA-TRS-403 report. By comparing 252Cf-calibrated dose responses with reference values derived from fluence-to-dose conversion coefficients, this study provides recommendations for neutron field characterization and the corresponding dose correction factors. Further sensitivity studies confirm the appropriateness of the proposed scheme and indicate that (1) the spectral correction factors are nearly independent of the selection of three commonly used calibration sources: 252Cf, 241Am-Be and 239Pu-Be; (2) the derived correction factors for Bonner spheres of various sizes (6”−9”) are similar in trend and (3) practical high-energy neutron indexes based on measurements can be established to facilitate the application of these correction factors in workplaces.

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