| 摘要 |
PURPOSE:To facilitate measurement and analysis by measuring the effective multiplication factor of a neutron multiplication system from the ratio of the counting rate of high energy gamma rays emitted by nuclear fission and the counting rate of low energy gamma rays emitted from a fissile nuclide. CONSTITUTION:The fissile nuclide of a fuel region 1 consists of uranium 235 (<235>U) and plutonium 239 (<239>Pu) and the concn. of both of them are respectively set to N<5> and N<9>, and the nuclear fission areas thereof are respectively set to sigmaf<5>, Nf<9>. At this time, a proportional equation of XHinfinity (N<5>sigmaf<5>+N<9>sigmaf<9>)phi...3 aXLinfinity N<5>+N<9>...3b is obtained XH/XL is proportional to the value of the right side represented by formula I. That is, a value K can be determined from the ratio of XH/XL according to the formula I. By this method, a neutron multiplica tion factor and the concn. of a fissile nuclide can be easily measured in a non- destructive manner.
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