【摘要】 本文介绍作者进一步研究双滤膜法测²²²Rn 的工作结果。主要讨论了由过滤法测氡子体的基本方程推导出测定²²²Rn 浓度的一般公式和衰变、扩散校正系数的计算公式。这些公式同时考虑了衰变和扩散对测定结果的影响。采用壁沉积方法,测得 RaA 的扩散系数 D=0.071cm²/s。文中还分析了双滤膜法测²²²Rn 的误差传递问题,结果表明,随着μ值（μ=0.06πDL/q,L 为采样管长度）的减小’D和取样流速 q 的误差对²²²Rn 浓度测定结果的影响也显著减小。试从理论上解释该方法用于低μ条件时精密度和准确度都较高的特点。更多还原

【Abstract】 The paper presents the results of further study of two-filtermethod for determining ²²²Rn.A general formula for calculating ²²²Rnconcentration and an accurate expression for disintegration-diffusion correc-tion coefficient Z_f were derived from the basic cquation for determining²²²Rn daughters with filter method and by considering both disintegrationand diffusion of ²²²Rn daughters during travel time in the sampling tube.The diffusion coefficient of RaA atoms,being 0.071cm²/s,was determinedusing two-filter wall deposition method.The error propagation in two-filtermethod was also studied and it was found that the influence of uncertaintyof diffusion coefficient D and sampling flow rate q on the result of determ-ination of ²²²Rn decreases significantly with the decreaae of the parameterμ（μ=O.06πDL/q,where L is the length of sampling tube）.This explainedtheoretically why the precision and accuracy of two-filter method are sohigh when used in low μ value.更多还原