Personnel neutron dosimetry using electrochemically etched CR-39 foils

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A personnel neutron dosimetry system has been developed based on the electrochemical etching of CR-39 plastic at elevated temperatures. The doses obtained using this dosimeter system are more accurate than those obtained using other dosimetry systems, especially when varied neutron spectra are encountered. This Cr-39 dosimetry system does not have the severe energy dependence that exists with albedo neutron dosimeters or the fading and reading problems encountered with NTA film. The dosimetry system employs an electrochemical etch procedure that be used to process large numbers of Cr-39 dosimeters. The etch procedure is suitable for operations where the number of personnel ... continued below

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Pages: 44

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Hankins, D.E.; Homann, S. & Westermark, J. September 17, 1986.

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Description

A personnel neutron dosimetry system has been developed based on the electrochemical etching of CR-39 plastic at elevated temperatures. The doses obtained using this dosimeter system are more accurate than those obtained using other dosimetry systems, especially when varied neutron spectra are encountered. This Cr-39 dosimetry system does not have the severe energy dependence that exists with albedo neutron dosimeters or the fading and reading problems encountered with NTA film. The dosimetry system employs an electrochemical etch procedure that be used to process large numbers of Cr-39 dosimeters. The etch procedure is suitable for operations where the number of personnel requires that many CR-39 dosimeters be processed. Experience shows that one full-time technician can etch and evaluate 2000 foils per month. The energy response to neutrons is fairly flat from about 80 keV to 3.5 MeV, but drops by about a factor of three in the 13 to 16 MeV range. The sensitivity of the dosimetry system is about 7 tracks/cm/sup 2//mrem, with a background equivalent to about 8 mrem for new CR-39 foils. The limit of sensitivity is approximately 10 mrem. The dosimeter has a significant variation in directional dependence, dropping to about 20% at 90/sup 0/. This dosimeter has been used for personnel neutron dosimetry at the Lawrence Livermore National Laboratory for more tha 18 months. 6 refs., 23 figs., 2 tabs.

Physical Description

Pages: 44

Notes

NTIS, PC A03/MF A01; 1.

Source

  • Technology transfer meeting on CR-39 neutron track detectors and the neutron + gamma total dose meter, Aurora, CO, USA, 24 Sep 1986

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  • Other: DE86016075
  • Report No.: UCRL-95350
  • Report No.: CONF-8609153-1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5103465
  • Archival Resource Key: ark:/67531/metadc1054939

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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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Creation Date

  • September 17, 1986

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 31, 2018, 6:34 p.m.

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Hankins, D.E.; Homann, S. & Westermark, J. Personnel neutron dosimetry using electrochemically etched CR-39 foils, article, September 17, 1986; California. (digital.library.unt.edu/ark:/67531/metadc1054939/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.