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用阈探测器中子活化法测量了５０ＭｅＶ／ｕ(１８)离子轰击Ｂｅ、Ｃｕ、Ａｕ厚靶出射中子的注量率分布，并利用中子注量率对剂量当量率的转换因子，得到了重离子实验靶区的中子剂量当量率分布。
Using the threshold detector neutron activation method, the injection rate distribution of the emergent neutron beams irradiated by 50 MeV / u (18) ions on Be, Cu and Au targets was measured. The conversion factor of the dose equivalent ratio of neutron fluence rate was obtained The distribution of neutron dose equivalence rate in heavy ion target area.