氡及其子体在自然界和人工建材中广泛存在,氡的测量与控制涉及国防和民用的众多领域,随着测量目的不同,各种测量方法得到应用,测值间存在较大差异,量值溯源及校准工作具有重要意义,目前国内的氡测量标准都是相对标准,它们定值最终溯源于镭标准物质,而标准镭源较高的不 Radon and its daughters exist widely in nature and artificial building materials. The measurement and control of radon involve many fields of national defense and civil use. With the different measurement purposes, various measurement methods have been applied, and there are big differences between the measured values. Traceability and calibration work of great significance, the current domestic radon measurement standards are relative standards, their final value traceable to the radium reference material, and the standard radium source is not high