| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Research Abstract |
The origin of the substance that adhered to the wooden tub at salt-production site was attempted to be determined by examining the environmental radioactivity in the substance by environmental radioactivity and isotopes. It was suggested that the adhesion could originate from not only seawater but also the seaweed and/or seagrass. Furthermore, the base that judged provenance identification of Moshio was obtained from some trace elements of the seaweed.
In addition, iodine isotopes, ^<127>I and ^<129>I, were isolated from marine algal samples to obtain ^<129>I/^<127>I ratios. The ^<129>I/^<127>I ratio in algae collected from 1987 was 100-1000 times as high as the ratio measured in algae from before 1945. This dramatic increase in ^<129>I/^<127>I ratio after 1945 was attributed to human activity.
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