Preparation of Pure Plutonium Metal Standards for Nondestructive Assay

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To calibrate neutron coincidence and neutron multiplicity counters for passive assay of plutonium, certain detector parameters must be determined. When one is using small plutonium metal samples, biases can be introduced from non-zero multiplication and impurities. This paper describes preparing small, pure plutonium metal standards with well-known geometries to enable accurate multiplication corrections and with acceptably low levels of impurities. To minimize multiplication, these standards are designed as 2-cm-diameter foils with varying thicknesses and masses of 1.4, 3.6, and 7.2 g plutonium. These standards will significantly improve characterization and calibration of neutron coincidence and multiplicity counters. They can also be ... continued below

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388 Kilobytes pages

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Hsue, S. -T.; Stewart, J. E. & Krick, M. S. November 1, 2000.

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Description

To calibrate neutron coincidence and neutron multiplicity counters for passive assay of plutonium, certain detector parameters must be determined. When one is using small plutonium metal samples, biases can be introduced from non-zero multiplication and impurities. This paper describes preparing small, pure plutonium metal standards with well-known geometries to enable accurate multiplication corrections and with acceptably low levels of impurities. To minimize multiplication, these standards are designed as 2-cm-diameter foils with varying thicknesses and masses of 1.4, 3.6, and 7.2 g plutonium. These standards will significantly improve characterization and calibration of neutron coincidence and multiplicity counters. They can also be equally useful for gamma-ray spectrometry and calorimetry. Five sets will be made: four for other US Department of Energy plutonium facilities, and one set to remain at Los Alamos. We will also describe other nondestructive assay standards that are planned for the next few years.

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388 Kilobytes pages

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INIS; OSTI as DE00775883

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  • Other Information: PBD: 1 Nov 2000

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  • Report No.: LA-13760-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/775883 | External Link
  • Office of Scientific & Technical Information Report Number: 775883
  • Archival Resource Key: ark:/67531/metadc724044

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  • November 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 23, 2016, 12:12 p.m.

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Hsue, S. -T.; Stewart, J. E. & Krick, M. S. Preparation of Pure Plutonium Metal Standards for Nondestructive Assay, report, November 1, 2000; New Mexico. (digital.library.unt.edu/ark:/67531/metadc724044/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.