first collision probability
... fire-fighting water消防水 first collision probability首次碰撞几率 first core第一堆芯 ...
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本文利用多区首次碰撞几率，推导计算圆柱形控制棒黑度的公式。
In this paper, the multi-region first collision probabilities are used to derive the formula for calculating blackness of a cylindrical control rod.
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