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目的:研究中国参考人模体受裂变中子瞬间照射下主要器官组织中n 24Na产额，为人员中子受照剂量估算提供基础数据。n 方法:利用n 252Cf裂变中子源照射中国参考人模体，测量不同器官和组织的当量液中n 24Na的区间计数，通过多重数学方法分析计算n 24Na活度和中子注量，经归一化后获得结果。n 结果:获得在n 252Cf裂变中子瞬间照射条件下，心脏、肝脏、两肺、脑组织及人体上、中、下段组织中的n 24Na比活度，其结果在(0.739～3.191)×10n -7(Bq·cmn 2)·gn Na-1范围。n 结论:通过与文献报道中的受中子照射时人体血液中n 24Na比活度比较，说明本研究建立的方法可行，结果可信。n “,”Objective:To study the production of n 24Na in major organs and tissues of Chinese reference human phantom following the instantaneous exposure to fission neutrons, so as to provide basic data for the estimation of neutron exposure dose.n Methods:252Cf fission neutron source was used to irradiate Chinese reference human phantom to measure the interval count of n 24Na in equivalent liquid of different organs and tissues. The n 24Na activity and neutron fluence were analyzed and calculated by multiple mathematical methods, and the results were obtained after normalization.n Results:The specific activities of n 24Na in heart, liver, lungs, brain, and the upper, the middle, and the lower section tissues of human body were obtained under the instantaneous irradiation of n 252Cf fission neutron source, and the results were within the range of (0.739~3.191)×10n -7(Bq·cmn 2)·gn Na-1.n Conclusion:According to the n 24Na specific activity of human blood under neutron irradiation reported in the literature, the method established in this study is feasible and the results are reliable.n