30,000 k ¥ .055 _ 25,000 20,000 }+- 15,000 - C/M Arbitrary Units wi85 A - 39 plankton B3 plankton c - 38 plankton - Lo 10,000 5,000 1,000 Fig. 2. Gamma spectrum curves of plankton samples collected at stations 3, 38 and 39 during the Collett survey.

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