Assays and screening of alpha contaminated soils using low-resolution alpha spectroscopy of thick soil samples

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Description

A new approach to estimating concentrations of alpha-emitting contaminants (e.g. U, Th, Ra, Pu, Am) in soil samples has been evaluated. The Victoreen Alpha Activity Monitor has been designed to empirically assay soil samples using low-resolution alpha spectroscopy, of thick soil samples. Pre-processing of the soil samples is minimal, involving only drying the soils and milling them to reduce inhomoceneities. Several laboratory tests of the instrument have been conducted. It has been shown that the instrument obeys simple counting statistics with measurement reproducibility improving with the inverse square root of the counting time. Using acquisition times of 1 to 24 ... continued below

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9 p.

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Meyer, K.E.; Lucas, A.C. & Padovan, S. April 1, 1995.

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  • Meyer, K.E. Oak Ridge National Lab., TN (United States)
  • Lucas, A.C. Chargrin Falls, OH (United States)
  • Padovan, S. Oak Ridge Inst. for Science and Education, TN (United States)

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Description

A new approach to estimating concentrations of alpha-emitting contaminants (e.g. U, Th, Ra, Pu, Am) in soil samples has been evaluated. The Victoreen Alpha Activity Monitor has been designed to empirically assay soil samples using low-resolution alpha spectroscopy, of thick soil samples. Pre-processing of the soil samples is minimal, involving only drying the soils and milling them to reduce inhomoceneities. Several laboratory tests of the instrument have been conducted. It has been shown that the instrument obeys simple counting statistics with measurement reproducibility improving with the inverse square root of the counting time. Using acquisition times of 1 to 24 hours the instrument Generated alpha assays of eighteen reference and field soil samples which were in good agreement with radiochemical analyses. It was observed that the alpha activity due to a 10pCi/g {sup 239}Pu spike added to a clean soil could be very readily distinguished from the 14pCi/g background activity of the soil. In a mock field screening test of 100 Pu-contaminated soils, the instrument demonstrated screening success rates ranging from 70% (at a screening level of 5pCi/g) to greater than 90% (at a screening level of 30pCi/g).

Physical Description

9 p.

Notes

INIS; OSTI as DE95008969

Source

  • 4. international symposium on field screening methods for hazardous wastes and toxic chemicals, Las Vegas, NV (United States), 22-24 Feb 1995

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  • Other: DE95008969
  • Report No.: CONF-950209--8
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 82457
  • Archival Resource Key: ark:/67531/metadc778776

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  • April 1, 1995

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  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 21, 2016, 3:30 p.m.

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Meyer, K.E.; Lucas, A.C. & Padovan, S. Assays and screening of alpha contaminated soils using low-resolution alpha spectroscopy of thick soil samples, article, April 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc778776/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.