Analysis of neutron and secondary gamma-ray transport in air-over-ground geometry by PALLAS-2DCY-FC code.
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概要
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Comparisons are made between PALLAS calculated with meaured neutron and γ-ray doses above the ground in an air-ground medium for HENRE accelerator and BREN reactor, yielding good agreements except for a 8.23-m height of HENRE source, in which the cal-culation overestimates the neutron dose by a factor of 1.5 due to the use of a rough angular quadrature set. Disregard of the ground results in a decrease by a factor of 2 in both neutron and γ-ray doses compared with those for the presence of the ground, while for an infinite-air medium both these doses increase with distances from the source, which in-dicates that the ground should not be ignored in the neutron and secondary r-ray transport calculation. For assumed neutron skyshine calculations disregard of the ground results in a decrease in the neutron dose by a factor of 1.5 and 1.7 and also in the secondary γ-ray dose by a factor of 1.35 and 35 respectively for a 14-MeV source and a fission source. In addition to the importance of inclusion of the ground in neutron skyshine calculations, an additional essential factor is the secondary γ-ray production due to neutron inelastic scatter-ing interaction with nitrogen for the 14-MeV source, or the one due to neutron capture interactions in both ground and air for the fission source.
- 一般社団法人 日本原子力学会の論文
著者
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TANAKA Shun-ichi
Japan Atomic Energy Research Institute
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Takeuchi Kiyoshi
Tokai Branch Ship Research Institute
関連論文
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