Abstract

1 to 2 grams of core-sampled deep-sea deposit is leached with a hot hydrochloric acid solution for one hour and thorium is separated by using exchange resin. A small amount of solution containing thorium is evaporated to dryness on a platinum disc with which a rays from 230Th and 232Th are measured with a ray spectrometer. From the ratio of a ray of 230Th (Io) and 232Th, the rate of deposition is estimated. For a sample collected at 34°25'N, 142°17'E from the depth of 7, 400 m, the rate of deposition of 6 mm/103 y is obtained.

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