Notes: Radon regulations for existing dwellings and public buildings are established in Sanitary rules and norms SanPiN 2.6.1.2523-09 "Norms of radiation safety (NRB-99/2009)", Paragraph 5.3.3.
Radon regulations for existing industrial buildings are established in Sanitary rules and norms SP 2.6.1.2612-10 "Basic sanitary rules for the provision of radiation safety (OSPORB 99/2010)", Paragraph 5.2.2.
Existing buildings after the renovations, remodeling, major alterations are treated as new.
Radon regulations for workplaces are established in "Norms of radiation safety (NRB-99/2009)", Section 4.  