Neutron flux intercomparison at NBS
- 1 November 1978
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards
- Vol. 83 (6) , 555-561
- https://doi.org/10.6028/jres.083.037
Abstract
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 3He proportional counter and a BF3 counter imbedded in a polyethylene sphere, were determined at neutron energies of 250 keV and 560 keV. The efficiency of the 3He 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 BF3 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.Keywords
This publication has 0 references indexed in Scilit: