Determination of the neutron energy spectrum of a radial neutron beam at a TRIGA reactor

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:454

Article

Giegel, Sam H.^1,2  Pope, Chad L.¹  Craft, Aaron E.² 

[1] Idaho State Univ, Pocatello, ID 83209 USA

[2] Idaho Natl Lab, Idaho Falls, ID 83402 USA

关键词: Neutron beam;    Neutron energy;    Energy spectrum;    UMG;    MAXED;    GRAVEL;   

DOI  :  10.1016/j.nimb.2019.05.072

来源: Elsevier

【 摘 要 】

The neutron energy spectrum was measured as part of a neutron beam characterization effort performed on the Neutron Radiography Reactor (NRAD) at the Idaho National Laboratory. The spectrum was determined by using multi-foil activation measurements coupled with unfolding algorithms with the software package Unfolding with MAXED and GRAVEL (UMG) and the Monte-Carlo N-Particle (MCNP6) transport code. The resulting neutron energy spectrum which was implemented into an MCNP6 model of the neutron beam to contribute to future studies. The total neutron flux is 7.06 x 10(7) n/cm(2)s with a 2 sigma error of 0.17%. The energy spectrum contains a large thermal neutron content, which is expected for the thermal reactor. The energy spectrum also includes a larger fast neutron content than typical neutron beams, which is attributed to the radial design of these beams where the beam has direct line of sight to the reactor core without much water to moderate the neutrons.

【 授权许可】

Free