The Hanford Critical Radiation Dosimeter

Technical Report · Mon Oct 31 23:00:00 EST 1977

DOI:https://doi.org/10.2172/1069231· OSTI ID:1069231

Glenn, R. D. ^[1]; Bramson, P. E. ^[1]

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1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

The Hanford critical radiation dosimeter, developed for measuring neutron dose and spectrum distribution from nuclear radiation, has been modified to incorporate new dosimetry techniques and to correct assembly errors. Modifications to the dosimeter package are 1) inclusion of ⁶LiF and ⁷LiF thermoluminescent dosimeter (TLD) chips in the foil holder at the lower end of the dosimeter "candle" for measurement of neutron and garrrna dose, 2) removal of the indium foil in the foil holder at the lower end of the dosimeter candle, to reduce gamma dose to the TLD chips due to activation of the indium foil, 3) inclusion of a ⁷LiF TLD chip for measuring gamma dose and removal of glass rod dosimeters from the foil holder at the top of the dosimeter candle, and 4) correction of an assembly error by moving the copper foil inside the cadmium shields. Neutron spectrum measurements will still yield five energy groups, and the dose measurement will give the single-collision neutron dose over a wide range of neutron energies with an accuracy of ±15% within the range of a few rads to several thousand rads. Measurement of gamma dose between 0.1 and 10,000 rads is provided by the ⁷LiF TLD chips placed in the top and bottom of the dosimeter candle.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: EY-76-C-06-1830
• OSTI ID: 1069231
• Report Number(s): PNL--2276
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Nuclear Criticality Safety Program (NCSP)