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

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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
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 shu
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Received: 2014-02-25
Revised: 1900-01-01
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Influence of thermal and resonance neutron on fast neutron flux measurement by 239Pu fission chamber

    Corresponding author: ZHENG Chun,

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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