摘要
氡气运移的研究成果表明,氡气的运移具有方向性。本文从实验入手,采用静态、累积、高灵敏度的测氡方法,对氡累积水平扩散分布进行了测量。采用最小二乘法拟合方法对不同温度条件下氡及其子体的水平扩散系数进行了计算。实验研究结果表明,氡及其子体的水平扩散系数与温度的相关系数为0.92,两者呈线性正相关关系;在恒温(30℃)条件下的实测水平扩散系数为0.049cm2·s-1;要使氡在空气中的水平扩散系数达到经典值0.1cm2·s-1,其环境温度应达到40℃以上。
Various experiments to measure radon migration coefficients indicated that the migration of radon and its daughters is directional. The horizontal diffusion data of radon in the air has been measured and studied in laboratory conditions using the accumulative radon-measurement method in a static state with high sensitivity. The mathematical calculation to obtain horizontal diffusion coefficients of radon under the condition of different temperature is done by fitting a difference equation to the measured radon diffusion data. A linear positive correlation coefficient of 0.92 between horizontal diffusion coefficient of radon and diffusion temperature, was obtained. The horizontal diffusion coefficient of radon is 0.049 cm^2·s^-1 at constant temperature of 30℃. To obtain the typical radon diffusion coefficient of 0.1cm^2·s^-1, the diffusion condition of above 40℃ can be deduced.
出处
《核技术》
CAS
CSCD
北大核心
2010年第3期219-222,共4页
Nuclear Techniques
基金
国家自然科学基金项目(10575022)
福建省自然科学基金项目(2007J0349)资助
关键词
氡及其子体
扩散系数
恒温
气温
Radon and its daughters, Diffusion coefficient, Constant temperature, Air temperature
