Measurements of DT and DD neutron yields by neutron activation on TFTR

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A variety of elemental foils have been activated by neutron fluence from TFTR under conditions with the DT neutron yield per shot ranging from 10{sup 12} to over 10{sup 18}, and with the DT/(DD+DT) neutron ratio varying from 0.5% (from triton burnup) to unity. Linear response over this large dynamic range is obtained by reducing the mass of the foils and increasing the cooling time, all while accepting greatly improved counting statistics. Effects on background gamma-ray lines from foil-capsule-material contaminants, and the resulting lower limits on activation foil mass, have been determined. DT neutron yields from dosimetry standard reactions on ... continued below

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14 p.

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Barnes, C.W.; Larson, A.R.; LeMunyan, G. & Loughlin, M.J. March 1, 1995.

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Description

A variety of elemental foils have been activated by neutron fluence from TFTR under conditions with the DT neutron yield per shot ranging from 10{sup 12} to over 10{sup 18}, and with the DT/(DD+DT) neutron ratio varying from 0.5% (from triton burnup) to unity. Linear response over this large dynamic range is obtained by reducing the mass of the foils and increasing the cooling time, all while accepting greatly improved counting statistics. Effects on background gamma-ray lines from foil-capsule-material contaminants, and the resulting lower limits on activation foil mass, have been determined. DT neutron yields from dosimetry standard reactions on aluminum, chromium, iron, nickel, zirconium, and indium are in agreement within the {+-}9% (one-sigma) accuracy of the measurements; also agreeing are yields from silicon foils using the ACTL library cross-section, while the ENDF/B-V library has too low a cross-section. Preliminary results from a variety of other threshold reactions are presented. Use of the {sup 115}In(n.n{prime}) {sup 115m}In reaction (0.42 times as sensitive to DT neutrons as DD neutrons) in conjunction with pure-DT reactions allows a determination of the DT/(DD+DT) ratio in trace tritium or low-power tritium beam experiments.

Physical Description

14 p.

Notes

INIS; OSTI as DE95009388

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  • 10. topical conference on high-temperature plasma diagnostics, Rochester, NY (United States), 8-12 May 1994

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  • Other: DE95009388
  • Report No.: PPPL--3054
  • Report No.: CONF-940552--45
  • Grant Number: AC02-76CH03073;W-7405-ENG-36
  • DOI: 10.2172/34430 | External Link
  • Office of Scientific & Technical Information Report Number: 34430
  • Archival Resource Key: ark:/67531/metadc685853

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  • March 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • July 28, 2016, 7:17 p.m.

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Barnes, C.W.; Larson, A.R.; LeMunyan, G. & Loughlin, M.J. Measurements of DT and DD neutron yields by neutron activation on TFTR, report, March 1, 1995; New Jersey. (digital.library.unt.edu/ark:/67531/metadc685853/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.