Skin Dose Equivalent Measurement from Neutron-Deficient Isotopes.

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Neutron-deficient-isotopes decay via positron emission and/or electron capture often followed by x-ray, gamma-ray, and 0.511 MeV photons from positron annihilation. For cases of significant area and/or personnel contamination with these isotopes, determination of skin dose equivalent (SDE) is required by 10CFR835. For assessment of SDE, we evaluated the MICROSPEC-2(TM) system manufactured by Bubble Technology Industries of Canada which uses three different probes for dose measurement. We used two probes: (1) the X-probe which measures lower energy (4 - 120 keV) photon energy distributions and determines deep dose equivalent, SDE and dose equivalent to eyes, and (2) the B-probe which measures ... continued below

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9 p.

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Hsu, Hsiao-Hua; Costigan, Steve A.; Romero, Leonard L. & Whicker, Jeffrey J. December 31, 1997.

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Description

Neutron-deficient-isotopes decay via positron emission and/or electron capture often followed by x-ray, gamma-ray, and 0.511 MeV photons from positron annihilation. For cases of significant area and/or personnel contamination with these isotopes, determination of skin dose equivalent (SDE) is required by 10CFR835. For assessment of SDE, we evaluated the MICROSPEC-2(TM) system manufactured by Bubble Technology Industries of Canada which uses three different probes for dose measurement. We used two probes: (1) the X-probe which measures lower energy (4 - 120 keV) photon energy distributions and determines deep dose equivalent, SDE and dose equivalent to eyes, and (2) the B-probe which measures electron (positron) energy distributions, and determines skin dose equivalent. Also, the measured photon and beta spectra can be used to identify radioactive isotopes in the contaminated area. Measurements with several neutron-deficient sources showed that this system provided reasonably accurate SDE rate measurements when compared with calculated benchmark SDE rates with an average percent difference of 40%. Variations were expected because of differences between the assumed geometries used by MlCROSPEC-2 and the calculations when compared to the measurement conditions.

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9 p.

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INIS; OSTI as DE98002655

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  • 1998 Health Physics Society midyear topical meeting, Mobile, AL (United States), 8-11 Feb 1998

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  • Other: DE98002655
  • Report No.: LA-UR--97-4184
  • Report No.: CONF-980203--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 627125
  • Archival Resource Key: ark:/67531/metadc692450

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 3:09 p.m.

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Hsu, Hsiao-Hua; Costigan, Steve A.; Romero, Leonard L. & Whicker, Jeffrey J. Skin Dose Equivalent Measurement from Neutron-Deficient Isotopes., article, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc692450/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.