Neutron flux intercomparison at NBS

National Bureau of Standards (NBS) participation in an International Bureau of Weights and Measures (BIPM) sponsored neutron flux intercomparison is described. The efficiencies of two transfer instruments, a gas-filled 3 He proportional counter and a BF 3 counter imbedded in a polyethylene sphere, w...

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Bibliographic Details
Published in:Journal of research of the National Bureau of Standards (1977) 1978-11, Vol.83 (6), p.555-561
Main Authors: Duvall, K.C., Meier, M.M., Wasson, O.A., Huynh, V.D.
Format: Article
Language:English
Subjects:
Physics and Chemistry
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Summary:National Bureau of Standards (NBS) participation in an International Bureau of Weights and Measures (BIPM) sponsored neutron flux intercomparison is described. The efficiencies of two transfer instruments, a gas-filled 3 He proportional counter and a BF 3 counter imbedded in a polyethylene sphere, were determined at neutron energies of 250 keV and 560 keV. The efficiency of the 3 He detector was determined by placing it in the flux monitored by the NBS “black” detector. Since the polyethylene sphere detector shadows the “black” detector, a secondary BF 3 counter was calibrated and it normalized the sphere and “black” detector runs. The efficiencies are reported and compared to the quantities determined at other participating standards laboratories.
ISSN:0160-1741
2376-5259
DOI:10.6028/jres.083.037