National Building Research Institute - Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, Israel.
Indoor Air. 2022 Sep;32(9):e13098. doi: 10.1111/ina.13098.
Significant temporal variations of radon and other air pollutants can be observed in any room, even one with permanently closed windows and doors. Therefore, a question arises: how can one assess the conformity of a room with a normative and make a reliable decision if the test lasts <1 year (days or months)? The measurement protocol fundamentally differs between Europe with its long-term testing tradition lasting several months, and the US where short-term tests of several days are more common. Neither the European nor the American protocols considers the temporal uncertainty of indoor radon, a factor that usually exceeds the instrumental uncertainty (including in long-term tests) and is 2-3 times higher the coefficient of variation (COV) commonly used to estimate temporal variations. This problem significantly complicates the creation of a rational and harmonized ISO standard. At the same time, strict adhering to the fundamental ISO/IEC rules within such concepts as "measurement uncertainty" and "conformity assessment" allows to control the coverage probability or reliability of decision making. Within ISO/IEC, proposed are a criterion of conformity assessment of a room with a normative for both short- and long-term measurements, as well as a statistical algorithm for determining the temporal uncertainty considering mode and measurements duration.
即使是窗户和门永久关闭的房间，也能观察到氡和其他空气污染物的显著时间变化。因此，出现了一个问题：如果测试持续时间<1 年（几天或几个月），如何评估一个房间与规范的符合性并做出可靠的决策？欧洲长期测试传统持续数月，而美国则更常见几天的短期测试，这两种测试协议之间存在根本差异。欧洲和美国的协议都没有考虑室内氡的时间不确定性，这个因素通常超过仪器不确定性（包括在长期测试中），并且是通常用于估计时间变化的变异系数（COV）的 2-3 倍。这个问题使得创建一个合理且协调的 ISO 标准变得非常复杂。同时，在“测量不确定性”和“符合性评估”等概念内严格遵守 ISO/IEC 的基本规则，允许控制决策的覆盖概率或可靠性。在 ISO/IEC 中，提出了一种适用于短期和长期测量的房间与规范符合性评估标准，以及一种考虑模式和测量持续时间的确定时间不确定性的统计算法。
