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在14兆电子伏中子活化分析工作中,测定中子发生器氚靶附近的中子通量分布,对于选择样品和标准的照射位置,确定样品大小以及结果的精确度都是很必要的。不少作者曾从理论上和实验上指出,氘束打在氚靶上得到的中子不能认为是各向同性的,即不能当作点源。德比克(J.Op.DeBeek)假设发生器中子源为圆盘源,对中子通量分布进行了理论计算,并与实验测定值作了比较,得到了满意的结果。实际上,中子通量分布是比较复杂的,它不但与中子源本身有关,而且与靶附近的环境有关。为此,我们根据活化分析的要求,对照射样品所占的空间通量分布做了实验测量。
In the 14 MeV Neutron Activation analysis, determining the neutron flux distribution near the neutron generator tritium target is necessary to select the sample and standard irradiation locations, to determine the sample size and the accuracy of the results. Many authors have theoretically and experimentally pointed out that the neutron produced by deuterium beam striking a tritium target can not be considered as isotropic, that is, it can not be regarded as a point source. J. Op. DeBeek Supposed that the generator neutron source is a disk source, the neutron flux distribution is theoretically calculated and compared with the experimentally determined values, and satisfactory results are obtained. In fact, the distribution of neutron flux is more complex, it is not only related to the neutron source itself, but also with the environment near the target. Therefore, based on the requirements of activation analysis, we made experimental measurements of the spatial flux distribution of irradiated samples.