Exposure from the radioactivity in building materials.
D003252:Construction Materials / Q000009:adverse effects*; D004781:Environmental Exposure; D006115:Greece; D011197:Potassium Radioisotopes / Q000032:analysis*; D011883:Radium / Q000032:analysis*; D013910:Thorium / Q000032:analysis*
D011197:Potassium Radioisotopes; D013910:Thorium; D011883:Radium