1. Council directive 2013/59/Euratom of 5 December 2013 laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation, and repealing Directives 89/618/Euratom, 90/641/Euratom, 96/29/Euratom, 97/43/Euratom and 2003/122/Euratom.
2. European Commission, Radiological Protection Principles concerning the natural radioactivity of building materials, Radiation Protection 112, 1999.
3. Radiation dose assessments for materials with elevated natural radioactivity, report STUK-B-STO 32;Markkanen,1995
4. Technical Report, CEN/TR 17113:2017 E, Radiation from Construction Products – Dose assessment of emitted gamma radiation, European Committee for Standardization (CEN), 2017.
5. Natural radioactivity in building material in the European Union: robustness of the activity concentration index I and comparison with a room model;Nuccetelli;J. Radiol. Prot.,2012