Application of geometry correction factors for low-level waste package dose measurements. Revision 1

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Description

Plans are to determine the Cs-137 content of low-level waste packages generated in High-Level Waste by measuring the radiation level at a specified distance from the package with a hand-held radiation instrument. The measurement taken at this specified distance, either 3 or 5 feet, is called the far-field measurement. This report documents a method for adjusting the gamma exposure rate (mR/hr) reading used in dose-to-curie determinations when the far-field measurement equals the background reading. This adjustment is necessary to reduce the conservatism resulting from using a minimum detection limit exposure rate for the dose-to-curie determination for the far-field measurement position. ... continued below

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21 p.

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Chandler, M.C. & Parish, B. January 5, 1995.

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Description

Plans are to determine the Cs-137 content of low-level waste packages generated in High-Level Waste by measuring the radiation level at a specified distance from the package with a hand-held radiation instrument. The measurement taken at this specified distance, either 3 or 5 feet, is called the far-field measurement. This report documents a method for adjusting the gamma exposure rate (mR/hr) reading used in dose-to-curie determinations when the far-field measurement equals the background reading. This adjustment is necessary to reduce the conservatism resulting from using a minimum detection limit exposure rate for the dose-to-curie determination for the far-field measurement position. To accomplish this adjustment, the near-field (5 cm) measurement is multiplied by a geometry correction factor to obtain an estimate of the far field exposure rate (which is below instrument sensitivity). This estimate of the far field exposure rate is used to estimate the Cs-137 curie content of the package. This report establishes the geometry correction factors for the dose-to-curie determination when the far-field gamma exposure measurement equals the background reading. This report also provides a means of demonstrating compliance to 1S Manual requirements for exposure rate readings at different locations from waste packages while specifying only two measurement positions. This demonstration of compliance is necessary to minimize the number of locations exposure rate measurements that are required, i.e., ALARA.

Physical Description

21 p.

Notes

INIS; OSTI as DE96001690

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  • Other Information: PBD: 5 Jan 1995

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  • Other: DE96001690
  • Report No.: WSRC-TR--94-0413-Rev.1
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/119923 | External Link
  • Office of Scientific & Technical Information Report Number: 119923
  • Archival Resource Key: ark:/67531/metadc620837

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  • January 5, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 9, 2016, 4:47 p.m.

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Chandler, M.C. & Parish, B. Application of geometry correction factors for low-level waste package dose measurements. Revision 1, report, January 5, 1995; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc620837/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.