Guam’s coral provides fascinating insights into the carbon-14 spikes resulting from US nuclear tests in the 1950s. Evidence shows that fallout from these tests journeyed to Guam through Pacific currents, with Operation Castle in 1954 leaving the most pronounced mark. The coral’s growth layers function as a natural record of this radioactive fallout, assisting researchers in examining ocean currents and the spread of radioactive isotopes across the water.
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