In 1980, Ministry of Building and Building Materials Industry, the Central Laboratory for Radiological Protection (abbreviated as CLRP), Ministry of Health and Social Welfare have agreed to issue the compulsory regulation of performing the validation of investigations of building raws and materials. Method of measurement, apparatus and method of evaluation of results of the investigations have been recommended for the whole country.
The following two criteria of usefulness of a building material for housing and public building have been accepted,
• f₁ = 0.00027 S_K + 0.0027 S_Ra + 0.0043 S_Th Ł 1 (this one limits exposition of the whole body to gamma radiation);
• f₂ = S_Ra Ł 185 Bq/kg (this one limits exposition of lung epithelium to progeny of radon ²²²Rn exhalated from the building walls).
The CLRP and Institute of Building Technology supervise over correctness (agreement with the regulations) of operation of laboratories in Departments of Building Industry and Energy, organize training of the personnel and collect results of the measurements, From 1980 till 1991, results of measurements of 6550 samples from 550 localities were collected in computer data base organized in the CLRP. In this paper, results of examination of selected groups of building raws and materials have been presented. Annual average values of the qualification coefficients f₁ and f₂ have been also analyzed.