Shuffler bias corrections using calculated count rates

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Description

Los Alamos National Laboratory has two identical shufflers that have been calibrated with a dozen U{sub 3}O{sub 8} certified standards from 10 g {sup 235}U to 3600 g {sup 235}U. The shufflers are used to assay a wide variety of material types for their {sup 235}U contents. When the items differ greatly in chemical composition or shape from the U{sub 3}O{sub 8} standards a bias is introduced because the calibration is not appropriate. Recently a new tool has been created to calculate shuffler count rates accurately, and this has been applied to generate bias correction factors. The tool has also ... continued below

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4 p.

Creation Information

Rinard, Phillip M.; Hurd, J. R. (Jon R.) & Hsue, F. (Faye) April 1, 2001.

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Description

Los Alamos National Laboratory has two identical shufflers that have been calibrated with a dozen U{sub 3}O{sub 8} certified standards from 10 g {sup 235}U to 3600 g {sup 235}U. The shufflers are used to assay a wide variety of material types for their {sup 235}U contents. When the items differ greatly in chemical composition or shape from the U{sub 3}O{sub 8} standards a bias is introduced because the calibration is not appropriate. Recently a new tool has been created to calculate shuffler count rates accurately, and this has been applied to generate bias correction factors. The tool has also been used to verify the masses and count rates of some uncertified U{sub 3}O{sub 8} standards up to 8.0 kg of {sup 235}U which were used to provisionally extend the calibration beyond the 3.6 kg of {sup 235}U mass when a special need arose. Metallic uranium has significantly different neutronic properties from the U{sub 3}O{sub 8} standards and measured count rates from metals are biased low when the U{sub 3}O{sub 8} calibration is applied. The application of the calculational tool to generate bias corrrections for assorted metals will be described. The accuracy of the calculational tool was verified using highly enriched metal disk standards that could be stacked to form cylinders or put into spread arrays.

Physical Description

4 p.

Source

  • "Submitted to: 42nd Annual INMM Meeting, Indian Wells, CA, July 15-19, 2001"

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  • Report No.: LA-UR-01-2931
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975347
  • Archival Resource Key: ark:/67531/metadc930163

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  • April 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Description Last Updated

  • Dec. 12, 2016, 4:48 p.m.

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Rinard, Phillip M.; Hurd, J. R. (Jon R.) & Hsue, F. (Faye). Shuffler bias corrections using calculated count rates, article, April 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc930163/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.