The aim of this task is to develop options for harmonisation of indoor and geogenic radon data, where appropriate using practical examples.
Harmonisation can follow two different approaches. “Bottom-up” harmonisation intends to implement the same methodology to ensure consistency of results, while “top-down” harmonisation attempts to make existing results comparable and jointly interpretable if the results are inconsistent due to different methodologies. While applying a standard method resulting from “bottom-up” harmonisation makes sense when starting new surveys or in the initial phase of a Rn action plan, it cannot be applied to existing results, in which case “top-down” harmonisation may be applicable. One example, which may prove relevant with regard to communicating the Rn problem to the public, is the lack of match between Rn priority areas across national borders.
The applicability of seasonal correction factors for radon data has been subject to controversies in the past. This task will explore under which circumstances and for which purposes seasonal correction factors for estimating radon exposure in dwellings are applicable and can be defined. The comparability between existing short-term and long-term radon measurements will be tested in order to assess the feasibility of data merging and therefore data set expansion. The results from Task 3.1, Task 3.2 and Task 3.3 will be used as the basis to propose instances where top-down harmonisation of
- indoor radon data and
- geogenic radon data and procedures may be reasonable.
To assess the relevance of inconsistency and hence of harmonisation, the impact on stakeholders will be taken as a criterion.