title: [Studies on background radioactivity in the Niigata City area--identification of natural nuclides present in underground (well) water samples].
abstract: Background radioactivity levels in Niigata city area were studied through the years of 1981-1984. As the results, it was found that the gross beta-radioactivity in underground (well) water samples were comparatively higher than those of other ground water samples. Ion chromatographic and gamma-ray spectroscopic determination revealed that this higher radioactivities were contributed by 40K rather than radium or thorium series nuclides or fallout originated 90Sr.
mesh_terms: D001417:Background Radiation; D002852:Chromatography, Ion Exchange; D007564:Japan; D011197:Potassium Radioisotopes / Q000032:analysis; D011839:Radiation, Ionizing; D011868:Radioisotopes / Q000032:analysis*; D013051:Spectrometry, Gamma; D014867:Water / Q000032:analysis*
chemical_list: D011197:Potassium Radioisotopes; D011868:Radioisotopes; D014867:Water