Optimization of etching and reading procedures for the Autoscan 60 track etch system

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Description

The Los Alamos National Laboratory is charged with measuring the occupational exposure to radiological workers and contractors throughout the Laboratory, which includes many different sites with multiple and varied radiation fields. Of concern here are the high energy neutrons such as those generated during accelerator operations at Los Alamos Neutron Science Center (LANSCE). In 1993, the Los Alamos National Laboratory purchased an Autoscan 60 automated reader for use with chemically etched CR39 detectors. The dosimeter design employed at LANL uses a plastic, hemispherical case, encompassing a polystyrene pyramidal detector holder. The pyramidal holder supports three detectors at a 35{degree} angle. ... continued below

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15 p.

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McKeever, R.; Devine, R. & Coennen, C. February 11, 1997.

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Description

The Los Alamos National Laboratory is charged with measuring the occupational exposure to radiological workers and contractors throughout the Laboratory, which includes many different sites with multiple and varied radiation fields. Of concern here are the high energy neutrons such as those generated during accelerator operations at Los Alamos Neutron Science Center (LANSCE). In 1993, the Los Alamos National Laboratory purchased an Autoscan 60 automated reader for use with chemically etched CR39 detectors. The dosimeter design employed at LANL uses a plastic, hemispherical case, encompassing a polystyrene pyramidal detector holder. The pyramidal holder supports three detectors at a 35{degree} angle. Averaging the results of the three detectors minimizes the angular dependence normally associated with a planar dosimeter. The Autoscan 60 is an automated reading system for use with CR39 chemical etch detectors. The detectors are immersed in an etch solution to enhance the visibility of the damage sites caused by recoil proton impact with the hydrogen atoms in the detector. The authors decided to increase the etch time from six hours to 15 hours, while retaining the 70 C temperature. The reason for the change in the etch is to enhance the sensitivity and precision of the CR39 detector as indicated by this study.

Physical Description

15 p.

Notes

INIS; OSTI as DE98006336

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  • Harshaw/NE 1998 TLD Users Group symposium, San Diego, CA (United States), 23-27 Mar 1998

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  • Other: DE98006336
  • Report No.: LA-UR--98-965
  • Report No.: CONF-980396--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/296848 | External Link
  • Office of Scientific & Technical Information Report Number: 296848
  • Archival Resource Key: ark:/67531/metadc683049

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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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  • February 11, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 1:39 p.m.

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McKeever, R.; Devine, R. & Coennen, C. Optimization of etching and reading procedures for the Autoscan 60 track etch system, report, February 11, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683049/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.