Change of coastal environment which accompanies with human activity obtained from radioactivity in seaweed View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2012-2015

FUNDING AMOUNT

25740000 JPY

ABSTRACT

The initial value for iodine derived from past marine sediments is said to be 1.5×10-12. However, when seaweed samples of known collection date, which were stored in the Hokkaido University Museum, were dated, values lower than 1.5×10-12 were obtained from pre-World War Two samples. This suggests that the initial value that a sample should have may have been overestimated because of emission and environmental pollution with artificial iodine 129 released through nuclear tests since 1945, and other sources.The 129I /127I ratios in algae samples collected in the pre-nuclear era were 10-13 - 10-12, whereas the ratio measured for present algae sample was more than 10-10, thus showing that the 129I /127I ratio in post-nuclear-era algae was 100 - 1000 times as high as that of pre-nuclear-era algae. This drastic increase in the 129I /127I ratio in the algae was attributed to human activity. More... »

URL

https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24686098

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