|Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
|Outline of Final Research Achievements
To elucidate the effect of anthropogenic thorium on formation of cloud nuclei, the concentration of trace metals and thorium isotopes in rainfall sample were measured. Thorium isotope ratios (230Th/232Th) were 5-6 order of magnitude higher than the average thorium isotopes ratio in crust, fractionation of uranium and thorium in industrial process was supposed. Thorium isotope ratios were clearly different between dissolved form and particulate form, indicating thorium in rainfall sample has several origins and which have different property of dissolution in the sample.