分层均匀假设求解源非均匀分布技术

Acquiring the nuclide distribution based on the hypothesis of layered uniform distribution

定量分析放射性废物中的核素残留量可为放射性废物的分类、处理处置提供主要依据。本文采用分层均匀假设求解放射性核素分布权重的方法解决了废物样品中放射性核素的非均匀分布问题,为?能谱法定量分析放射性废物中核素残留量时的源峰探测效率计算提供了重要技术支撑。研究表明,通过两次测量、求解矩阵方程非负解获取样品中核素的大致分布是可行的。

Background： The running of the nuclear system would produce a mass of radioactive waste, and the nuclide residual in these radioactive waste had to be analyzed. Purpose： The aim is to provide a main support to solve the problem of waste classifying and disposal by the quantitative analysis of the nuclide residual in the radioactive waste by gamma-ray spectra. Methods： The nuclide distribution has been researched by solving the weighted factor in every layer based on the hypothesis of layered uniform distribution, which could provide an important support for the calculation of detecting efficiency. Results： The weighted factor in every layer was calculated based on the hypothesis of layered uniform distribution. The measurement results from two different orientations, and the more accurate efficiency of source-peak were acquired. Conclusion： The results show that it is feasible to acquire the nuclide distribution by two-time measurement and solving the non-negative result of the matrix equation.