This chapter contains a lot of information on the new European approach to regulate natural radioactivity
in building materials.

• The main Directive that deals with natural radioactivity in building materials is the Euratom- Basic Safety Standards Directive (EU-BSS) and its approach to regulate building materials is described in Section 4.3. Some additional information on the link with the Construction Products Regulation (CPR) is provided in Section 4.3.1.
• For the reader who wants to explore the history of the EU-BSS and several important earlier documents in greater depth we refer to Section 4.2.
• For the reader who wonders how the Euratom drinking water Directive might impact on building materials we refer to Section 4.4.
• In Sections 4.5 and 4.6 current national legislations on natural radioactivity in building materials are considered in more detail.
• Several tools are described for the screening of the radiological properties of building materials. These tools are discussed in Section 4.7.