After the Bikini Atoll nuclear tests in 1954, the Japanese government asked the Geochemical Laboratory to analyze and monitor radioactivity in the seawater and in rainfall.
Although the atolls were evacuated soon after the test, 239 Marshallese on the Utirik, Rongelap, and Ailinginae Atolls were subjected to significant levels of radiation.
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The Koon shot of Operation Castle was a test of a University of California Radiation Laboratory designed thermonuclear device.