Calibration of a gamma calibration well with an energy-compensated Geiger-Mueller (G-M) tube.

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Description

A working-standard Radcal model 1515 radiation monitor with the 1800cc ion chamber was used previously at Los Alamos National Laboratory (LANL) to calibrate and perform routine QA checks on the low-level gamma well, which produces exposure rates in the range of 0.2 mR/h to 10 mR/h. During long integration times (e.g. 24-48 hrs) with the 1800 cc ion chamber, which were required to obtain the necessary precision, changes in temperature and pressure and fluctuations in the zero offset introduced errors that were difficult to account for. An energy compensated G-M tube (SHP-270) was calibrated as a Working Standard to calibrate ... continued below

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29 p.

Creation Information

George, G. L. (Gerald L.); Seagraves, D. T. (David T.) & Valdez, D. T. (Darlene T.) January 1, 2001.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 33 times , with 7 in the last month . More information about this article can be viewed below.

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Description

A working-standard Radcal model 1515 radiation monitor with the 1800cc ion chamber was used previously at Los Alamos National Laboratory (LANL) to calibrate and perform routine QA checks on the low-level gamma well, which produces exposure rates in the range of 0.2 mR/h to 10 mR/h. During long integration times (e.g. 24-48 hrs) with the 1800 cc ion chamber, which were required to obtain the necessary precision, changes in temperature and pressure and fluctuations in the zero offset introduced errors that were difficult to account for. An energy compensated G-M tube (SHP-270) was calibrated as a Working Standard to calibrate and perform QA checks on the low-level gamma well. Energy correction factors were determined since the SHP-270 does not have a linear energy response. Monte Carlo N-Particle (MCNP) code was used to determine the exposure rate in 50 keV energy bins as a function of source distance in the well. The results of these calculations were folded into the energy correction factors of the SHP-270 to determine the Corrected Exposure Rate as a function of source distance. To recalibrate the gamma well, the Corrected Exposure Rates were loaded into the source control algorithm, which was then verified to work correctly.

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29 p.

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  • Submitted to: American Radiation Safety Conference and Exposition Health Physics Society's 46th Annual Meeting, June 10-14, 2001, Cleveland, OH

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  • Report No.: LA-UR-01-2606
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975324
  • Archival Resource Key: ark:/67531/metadc930807

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Description Last Updated

  • Dec. 9, 2016, 10:55 p.m.

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George, G. L. (Gerald L.); Seagraves, D. T. (David T.) & Valdez, D. T. (Darlene T.). Calibration of a gamma calibration well with an energy-compensated Geiger-Mueller (G-M) tube., article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc930807/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.