Abstract
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.
Highlights
Introduction to traceRadonAn overlapping need exists between the climate research and radiation protection communities for improved traceable lowlevel radon activity concentration (222Rn) and radon flux measurements, combining the challenges of collecting, collating and modeling large datasets, with setting up new radiation protection services
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 these concentrations
Until recently state of the art was the application of one of the following three procedures for the calibration of 222Rn monitors -: a primary method based on a reference activity concentration realized by a primary radon gas standard and a calibration volume; a secondary method based on calibration via a reference monitor enclosed in the same atmosphere as the system under test; and a primary/secondary calibration in a constant atmosphere based on a radium emanation source
Summary
An overlapping need exists between the climate research and radiation protection communities for improved traceable lowlevel radon activity concentration (222Rn) and radon flux measurements, combining the challenges of collecting, collating and modeling large datasets, with setting up new radiation protection services. The EMPIR project 19ENV01 traceRadon works toward these goals for the benefit of both large scientific communities by providing the necessary infrastructure for measuring atmospheric radon activity concentrations from 1 Bq m−3 to 100 Bq m−3 and radon fluxes It will generate data at four selected European sites for validation of radon flux models and inventories and will create the first standard protocol for applying the radon tracer method (RTM). The meter and candela are already defined by physical constants, subject to correction to their present definitions While these changes are fundamental the overall change happened almost without being noticed because the new definitions improve the SI without modifying the size of any units. This ensures continuity with existing measurements despite the origin of traceability for each unit having shifted
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call