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Seawater samples were collected in Sagami Bay, western Northwest Pacific Ocean, and their 239+240 Pu activities and 240 Pu/ 239 Pu atom ratios were determined by α-spectrometry and sector field high-resolution ICP-MS. A few samples also were analyzed for 137 Cs activities. The 239+240 Pu inventory of 41.1Bqm −2 was equivalent to the expected cumulative...
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