氡子体气溶胶活度粒径分布监测系统的研制

重点探讨了基于金属筛网扩散组理论来测量氡子体活度粒径分布的Twomy非线性迭带算法、EM最大期望值算法，并据此给出一个氡子体活度粒径分析监测系统的实现方案；该系统通过筛网参数计算画出透过率曲线；然后，根据扩散组数据用这两种算法估算氡子体活度粒径分布，并给出氡子体活度粒径分布的直方图；还用标准的泊松粒径分布数据来验证这两种算法，并用该监测系统对室内空气、煤油灯燃气进行放射性活度粒径分布的测量和分析。实验结果表明两种算法得出的氡子体活度粒径分布呈双峰分布，其未结合态氡子体活度粒径范围、结合态氡子体活度粒径范围都与其它的研究相吻合；但在测量精度方面还有待进一步研究。

The design of radon progency radioactive size distribution analysis system

The estimate for the size distribution is determined from indirect observations using compu tational methods. The paper provides a solution of radon progency activity size distribution analysis monitoring system which is based on the parallel screen diffusional battery theory and estimate methods such as Twomy algorithm ,EM algorithm. In this paper the penetration curve is given by calculation of the wire screen type diffusion battery parameters; Two approximation algorithems including Twomy nonlinear iterative method , Expectation Maximization iterative method , are employed for the determi nation of size distribution of radon progency, and these two algorithm is verified by data of standard log-normal Possion distribution . The experiment results obtained from indoor air and burned kerosene air show a bimodal size distribution, which is similar to other's research. Further inter comparism stud ies are needed to further verify the system.