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一种新的方法用于评估抗膜中的扩散系数

Manuela Portaro¹, Ilaria Rocchetti¹, Gianfranco Galli²

¹Università degli Studi "Roma Tre", Dipartimento di Scienze, Largo San Leonardo Murialdo 1, 00146, Roma, Italy.

Journal of environmental radioactivity

|May 1, 2025

概括

一个新的实验装置TESTMAT测量了屏障材料中的扩散系数. 该方法使用弱源和专用软件 (ENDORSE) 进行准确的气减缓评估.

科学领域:

环境科学环境科学
辐射保护辐射保护
材料科学材料科学材料科学

背景情况:

室内 (Rn-222) 是一种已知的致癌物质,与肺癌有关.
子屏障材料对于建筑物防护子入至关重要.
精确测量扩散系数对于评估材料性能至关重要.

研究的目的:

引入一种新的实验设置,TESTMAT,用于测量扩散系数.
开发和验证专门的软件ENDORSE,用于分析扩散数据.
评估商用屏障材料的性能.

主要方法:

使用弱源和基于PVC的实验装置 (TESTMAT) 按照ISO/TS 11665-13.
开发了使用显式有限差方法和蒙特卡洛模拟进行数据分析和错误确定的ENDORSE软件.
进行了系统校准,背景评估和气密度评估.

主要成果:

测试装置和ENDORSE软件准确地建模了非静止扩散.
系统校准证实了考虑背景的重要性,特别是在高性能膜中.
样本持有器的气密性得到证实,泄漏常数明显低于子衰变常数.
根据材料厚度和源强度建立了最低检测极限.

结论:

使用低活性源测量扩散系数的可靠方法是TESTMAT装置.
恩多斯软件为扩散研究提供了可靠的数据分析,包括错误估计.
该研究成功测试和比较了三种防水膜,验证了该系统的有效性.

关键词:

室内子是室内的子.子屏障材料是一种子屏障材料.的扩散系数的扩散系数

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