Influence of thermal and resonance neutron on fast neutron flux measurement by <SUP>239</SUP>Pu fission chamber

ZENG Li-Na; WANG Qiang; SONG Ling-Li; ZHENG Chun

doi:10.1088/1674-1137/39/1/016001

Chinese Physics C> 2015, Vol. 39> Issue(1) : 016001 DOI: 10.1088/1674-1137/39/1/016001

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber

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Abstract：
The ²³⁹Pu fission chambers are widely used to measure fission spectrum neutron flux due to a flat response to fast neutrons. However, in the meantime the resonance and thermal neutrons can cause a significant influence on the measurement if they are moderated, which could be eliminated by using ¹⁰B and Cd covers. At a column enriched uranium fast neutron critical assembly, the fission reaction rates of ²³⁹Pu are measured as 1.791× 10^-16, 2.350×10^-16 and 1.385× 10^-15 per second for 15 mm thick ¹⁰B cover, 0.5 mm thick Cd cover, and no cover respectively, while the fission reaction rate of ²³⁹Pu is rapidly increased to 2.569× 10^-14 for a 20 mm thick polythene covering fission chamber. The average ²³⁹Pu fission cross-section of thermal and resonance neutrons is calculated to be 500 b and 24.95 b with the assumption of 1/v and 1/E spectra respectively, then thermal, resonance and fast neutron flux are achieved to be 2.30× 10⁶, 2.24× 10⁶ and 1.04× 10⁸ cm^-2·^-1.

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ZENG Li-Na, WANG Qiang, SONG Ling-Li and ZHENG Chun. Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber[J]. Chinese Physics C, 2015, 39(1): 016001. doi: 10.1088/1674-1137/39/1/016001

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Received: 2014-02-25
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber

Corresponding author: ZHENG Chun,

Received Date: 2014-02-25

Accepted Date: 1900-01-01

Available Online: 2015-01-05

Abstract: The ²³⁹Pu fission chambers are widely used to measure fission spectrum neutron flux due to a flat response to fast neutrons. However, in the meantime the resonance and thermal neutrons can cause a significant influence on the measurement if they are moderated, which could be eliminated by using ¹⁰B and Cd covers. At a column enriched uranium fast neutron critical assembly, the fission reaction rates of ²³⁹Pu are measured as 1.791× 10^-16, 2.350×10^-16 and 1.385× 10^-15 per second for 15 mm thick ¹⁰B cover, 0.5 mm thick Cd cover, and no cover respectively, while the fission reaction rate of ²³⁹Pu is rapidly increased to 2.569× 10^-14 for a 20 mm thick polythene covering fission chamber. The average ²³⁹Pu fission cross-section of thermal and resonance neutrons is calculated to be 500 b and 24.95 b with the assumption of 1/v and 1/E spectra respectively, then thermal, resonance and fast neutron flux are achieved to be 2.30× 10⁶, 2.24× 10⁶ and 1.04× 10⁸ cm^-2·^-1.

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Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber

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Influence of thermal and resonance neutron on fast neutron flux measurement by 239Pu fission chamber

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Influence of thermal and resonance neutron on fast neutron flux measurement by 239Pu fission chamber

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Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber