CRAM在放射性核素存量计算中的应用

发布时间：2018-08-04 17:34

【摘要】：在反应堆中,组成材料的稳定核素经受强中子辐照后,会被活化成放射性核素。这些核素及其衰变产物对工作人员的职业辐照剂量具有重要贡献。为了更好地进行人员的辐射防护工作,需要对放射性核素的存量进行精确计算。相对于核素平衡方程的其它求解方法,切比雪夫有理逼近方法(Chebyshev Rational Approximation Method,CRAM)在计算精度和效率方面具有综合性优势。首先介绍了CRAM的基本理论,随后选取典型的例题进行了测试验证。与解析解对比的结果表明,采用CRAM进行中子辐照下的核素活化衰变计算能够取得不错的效果,但是用于核素长期衰变计算可能导致计算错误。针对此问题,将收缩乘方技术与CRAM相结合,取得了正确的计算结果,拓展了CRAM的适用范围。
[Abstract]:In the reactor, the stable nuclide of the material is activated to radionuclide after strong neutron irradiation. These nuclides and their decay products contribute significantly to the occupational radiation doses of the workers. In order to carry out personnel's radiation protection work, it is necessary to calculate the radionuclide stock accurately. Compared with other methods for solving the equilibrium equation of nuclides, the Chebyshev rational approximation method (Chebyshev Rational Approximation method cream has a comprehensive advantage in computing accuracy and efficiency. Firstly, the basic theory of CRAM is introduced, and then the typical examples are selected to test and verify. Compared with the analytical solution, the results show that the calculation of nuclide activation decay under neutron irradiation by CRAM can achieve good results, but the calculation of long term decay of nuclide may lead to the calculation error. In order to solve this problem, the contraction multiplier technique is combined with CRAM, and the correct calculation results are obtained, and the applicable range of CRAM is expanded.
【作者单位】：华北电力大学核科学与工程学院;环境保护部核与辐射安全中心;
【基金】：国家自然科学基金(No.11605058) 国际热核聚变实验堆计划专项(No.2014GB119000) 中央高校基本科研业务费专项资金(No.2017MS041)资助~~
【分类号】：TL752

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