After the US conducted Bikini Atoll nuclear tests in 1954, the Japanese government asked the Geochemical Laboratory to analyze and monitor radioactivity in the seawater and in rainfall.
Usai uji nuklir Bikini Atoll tahun 1954, pemerintah Jepang meminta Laboratorium Geokimia menganalisis dan mengawasi radioaktivitas air laut dan hujan.