Furukawa M, Shingaki R, Masuda N, Nakasone S, Omori Y, Hosoda M, Tokonami S, Akata N., High indoor radon concentration observed in Okinawa, southwestern part of Japan. VI. Terrestrial Radionuclides in Environment International Conference on Environmental Protection, Veszprém, Hungary. (2018.5). (ポスター発表)