Natural radiation dose in Akiyoshi Cavern and on Karst Plateau.
D001417:Background Radiation; D055593:Geological Phenomena; D005844:Geology; D007564:Japan; D011197:Potassium Radioisotopes; D011829:Radiation Dosage; D011839:Radiation, Ionizing; D011883:Radium; D013910:Thorium; D014501:Uranium
D011197:Potassium Radioisotopes; D014501:Uranium; D013910:Thorium; D011883:Radium