Turkoglu, D.
, Downing, R.
, Chen, W.
, Sahin, D.
and Cook, J.
(2016),
A 3He beam stop for minimizing gamma-ray and fast-neutron background, Journal of Radioanalytical and Nuclear Chemistry, [online], https://doi.org/10.1007/s10967-016-4954-7
(Accessed December 16, 2024)
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A 3He beam stop for minimizing gamma-ray and fast-neutron background
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Abstract
Prompt gamma-ray activation analysis facilities with high neutron currents (≥109 s-1) generate triton-induced fast neutrons from 6Li-loaded collimators and beam stops at rates that soon damage gamma-ray detectors. We develop an alternative beam stop design using 3He gas that produces negligible gamma-ray and fast-neutron background following neutron absorption. Replacing a 6Li glass beam stop with a test cell containing 2.5 MPa·cm of 3He reduced fast neutron production by 73%. An optimal 3He beam stop design with a 100-µm-thick entrance window, modeled using MCNP6, enables operation of detectors closer to the beam stop.Citation
Journal of Radioanalytical and Nuclear Chemistry
Volume
311
Issue
2
Pub Type
Journals
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Keywords
prompt gamma-ray activation analysis, instrument design, Monte Carlo radiation transport, neutron shielding, gamma-ray background, helium, lithium, boron
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Created August 6, 2016, Updated November 10, 2018