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The first measurements of radium 228 in the ocean are reported, and the analytical methods of determining Ra228 and Th228 are discussed. Measurable excesses of both Ra228 and Th228 relative to the Th232 exist in the ocean. Ra228 should prove a valuable tracer for studies of water movements. Its 6.7-year half-life makes it applicable to processes with a time scale of 3–25 years.
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Willard S. Moore (1969) studied this question.
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