Neutron Sources for Standard-Based Testing

Radev, Radoslav¹  McLean, Thomas² 

[1]Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

[2]Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: NEUTRON EMISSION;    CALIFORNIUM 252;    CALIBRATION STANDARDS;    NEUTRON DETECTORS;    ENERGY SPECTRA;    SPONTANEOUS FISSION;   

DOI  :  10.2172/1184089
RP-ID  :  LLNL-TR--664160
PID  :  OSTI ID: 1184089
Others  :  TRN: US1500302

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The DHS TC Standards and the consensus ANSI Standards use ²⁵²Cf as the neutron source for performance testing because its energy spectrum is similar to the ²³⁵U and ²³⁹Pu fission sources used in nuclear weapons. An emission rate of 20,000 ?? 20% neutrons per second is used for testing of the radiological requirements both in the ANSI standards and the TCS. Determination of the accurate neutron emission rate of the test source is important for maintaining consistency and agreement between testing results obtained at different testing facilities. Several characteristics in the manufacture and the decay of the source need to be understood and accounted for in order to make an accurate measurement of the performance of the neutron detection instrument. Additionally, neutron response characteristics of the particular instrument need to be known and taken into account as well as neutron scattering in the testing environment.