The adoption of the Council Directive 2013/59/EURATOM into Austrian national law generated new challenges for businesses, authorities and measurement services. The law defines radon priority regions in which all employers are obliged to hire an authorised radon-monitoring service to determine radon activity concentration at workplaces in basements and on ground floors. In this paper, an overview of our experiences with the process of becoming an accredited and authorised radon-monitoring body using integrating and time-resolved radon measurement equipment is given. The main challenges to overcome, such as determination of measurement uncertainty, conducting metrologically traceable calibration of the track-etch detector system, information not covered by ISO 11665-1, ISO 11665-4 and ISO 11665-5, availability of proficiency tests, etc., are described. This paper aims to be a guideline for laboratories seeking accreditation in the field of radon activity concentration measurements.
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