| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The purpose of this study is to establish a biosystem for the quantification of the detrimental effects from radiation at organ and chromosomal levels in the thymus of medaka fish.
In the present work, we have successfully established a biosystem. By using this system, the threshold dose from continuous gamma-irradiation was verified, at which significant atrophy of the thymus and marked increase in the frequency of the micronucleated cells were induced. So far, it was estimated that the threshold was at 10-50mGy/h for the thymus atrophy, and 1-10mGy/h for the increase of the micronucleated cells in medaka that had been exposed to gamma-irradiation for 2 weeks. These dose rates are much higher (more than 10 times) in comparison with the highest air dose rate (100uSv/h) in the 'difficult-to-return zones' near the crippled Fukushima nuclear plant designated by the government measured just after the accident.
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