Thoron (²²⁰Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in dwellings. However, contrary to radon (²²²Rn), limited information on thoron exposure is available. As a result no harmonized test procedures for determining thoron exhalation from building materials are available at present. This study is a first interlaboratory comparison of different test methods to determine the thoron exhalation and a pre-step to a harmonized standard. The purpose of this study is to compare the experimental findings from a set of three building materials that are tested, and to identify future challenges in the development of a harmonized standard.

从建筑材料中排放出的Thoron（²²⁰ Rn）已被公认为是住宅中辐射暴露的潜在来源。但是，与ra（²²² Rn）相反，关于暴露的信息有限。结果，目前没有用于确定建筑材料中materials气呼出的统一测试程序。这项研究是首次实验室间比较各种测试方法以确定气呼出的方法，也是迈向统一标准的第一步。这项研究的目的是比较三种被测试的建筑材料的实验结果，并确定在制定统一标准方面的未来挑战。