Study of n/gamma discrimination using He-3 proportional chamber in high gamma-ray fieldsopen access
- Authors
- Choi, Joonbum; Park, Junesic; Son, Jaebum; Kim, Yong Kyun
- Issue Date
- Feb-2019
- Publisher
- KOREAN NUCLEAR SOC
- Keywords
- He-3 proportional chamber; Neutron detector; n/gamma discrimination; Algorithm; High gamma-ray field
- Citation
- NUCLEAR ENGINEERING AND TECHNOLOGY, v.51, no.1, pp.263 - 268
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- NUCLEAR ENGINEERING AND TECHNOLOGY
- Volume
- 51
- Number
- 1
- Start Page
- 263
- End Page
- 268
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2259
- DOI
- 10.1016/j.net.2018.08.013
- ISSN
- 1738-5733
- Abstract
- The He-3 proportional chamber is widely used for neutron measurement owing to its high neutron detection efficiency and simplicity for gamma-ray rejection. In general, the neutron and gamma-ray signals obtained from the He-3 proportional chamber can be easily separated by the difference in the pulse heights. However, for a high gamma-ray field, the gamma-ray signal cannot be precisely eliminated by the pulse height due to gamma-ray pulse pileup which causes the pulse height of gamma-ray pulse to increase and making the pulses due to neutrons and gamma rays indistinguishable. In this study, an improved algorithm for n/gamma discrimination using a parameter, which is the ratio of the rise time to the pulse height, is proposed. The n/gamma discrimination performance of the algorithm is evaluated by applying it to Cf-252 neutron signal separation from various gamma-ray exposure rate levels ranging 0.1-5 R/h. The performance is compared to that of the conventional pulse-height analysis method in terms of the gamma elimination ratio. The suggested algorithm shows better performance than the conventional one by 1.7% (at 0.1 R/h) to 70% (at 5 R/h) for gamma elimination.
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