New metrology for radon at the environmental level
New metrology for radon at the environmental level
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DOI：
10.1088/1361-6501/ac298d
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发表时间：
2021-12-01
影响因子：
2.4
通讯作者：
Morosh, Viacheslav
中科院分区：
文献类型：
--
作者：
Roettger, Annette;Roettger, Stefan;Morosh, Viacheslav
氡气是公众接触自然产生的放射性的最大来源。然而，氡也是一种有用的示踪剂，可用于了解大气过程、评估化学品传输模型的准确性以及实现温室气体的综合排放估算。因此，为了大气、气候和辐射防护研究界的利益，需要一个健全的低水平大气氡观测计量系统。为此，我们在这里提出了一种针对低于 20 Bq m(-3) 的活度浓度的新校准方法，以及第一个便携式氡气监测仪原型，能够在这些浓度下实现 5%（k = 2）的不确定性。有关温室气体 (GHG) 排放的政策驱动法规的合规性检查是减缓气候变化工作的重要组成部分。独立、可靠的“自上而下”方法可以一致地应用于估算当地到区域范围的温室气体排放（例如氡示踪法（RTM）），是这一过程的重要组成部分。 RTM 依赖于观测到的氡气和温室气体浓度以及测量或模拟的氡通量。可靠的氡气通量图还可以极大地帮助欧盟成员国遵守欧洲理事会指令 2013/59/EURATOM。本文还介绍了 TraceRadon 项目，其主要目标包括概述 RTM 应用的标准化方法、创建具有氡浓度和氡通量测量可追溯链的基础设施，以及开发用于验证氡通量模型的工具。由于氡子体在地球伽马剂量率中占主导地位，由于已知氡通量与环境等效剂量率之间存在相关性，因此计划中的痕量氡活动也有望提高辐射防护预警网络的灵敏度。
Radon gas is the largest source of public exposure to naturally occurring radioactivity. However, radon is also a useful tracer for understanding atmospheric processes, assessing the accuracy of chemical transport models, and enabling integrated emissions estimates of greenhouse gases. A sound metrological system for low level atmospheric radon observations is therefore needed for the benefit of the atmospheric, climate and radiation protection research communities. To this end, here we present a new calibration method for activity concentrations below 20 Bq m(-3) and a prototype of the first portable radon monitor capable of achieving uncertainties of 5% (at k = 2) at these concentrations. Compliance checking of policy-driven regulations regarding greenhouse gas (GHG) emissions is an essential component of climate change mitigation efforts. Independent, reliable 'top down' methods that can be applied consistently for estimating local- to regional-scale GHG emissions (such as the radon tracer method (RTM)) are an essential part of this process. The RTM relies upon observed radon and GHG concentrations and measured or modeled radon fluxes. Reliable radon flux maps could also significantly aid EU member states comply with European COUNCIL DIRECTIVE 2013/59/EURATOM. This article also introduces the traceRadon project, key aims of which include outlining a standardized approach for application of the RTM, creating infrastructure with a traceability chain for radon concentration and radon flux measurements, and developing tools for the validation of radon flux models. Since radon progeny dominate the terrestrial gamma dose rate, the planned traceRadon activities are also expected to improve the sensitivity of radiation protection early warning networks because of the correlation known to exist between radon flux and ambient equivalent dose rates.