| Project/Area Number |
20510052
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Risk sciences of radiation/Chemicals
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| Research Institution | Osaka University |
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Principal Investigator |
NAKAJIMA Hiroo Osaka University, 大学院・医学系研究科, 助教 (20237275)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Tadashi 大阪大学, ラジオアイソトープ総合センター, 教授 (50153812)
HONGYO Tadashi 大阪大学, 大学院・医学系研究科, 准教授 (90271569)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 生物影響 / チェルノブイリ原発事故 / 低線量・低線量率放射線被曝 / 遺伝毒性 / 発がん性 / セシウム-137 / シミュレーション実験 / リスクアセスメント / チェルノブイリ原発放射能汚染 / 生物濃縮 / 核種体内動態 |
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| Research Abstract |
To simulate the radiocontamination in middle contaminated areas of Belarus (1997, 2005), mice were maintained for 8 months in the radioisotope facility with free access to drinking water containing ^<137>CsCl (0Bq/ml, 10Bq/ml and 100Bq/ml).
Mice were assessed the long term low dose rate and low dose internal and external radiation effect by the quantitative measurement of the contaminated radionuclides-induced DNA double-strand breaks by γ-H2AX foci in the organs. The micro nuclei test and the tumorigenicity of mouse lung were also examined under the same condition.
The number of γ-H2AX focus per hepatic cell was 1.4 (0Bq/ml), 9.5(10Bq/ml), 10.7(100Bq/ml), respectively. It was suggested that the genome damage caused internal low dose ^<137>Cs radiation were occurring chronically even in low dose contaminated area. But no significant difference was observed in the micro nuclei test. In addition, progress data (by 6 animals in each dose groups) is showing that the number of lung tumors per mouse induced by urethane under the same condition is 36.8(368/10) (0 Bq/ml), 44.1 (441/10) (10Bq/ml), 44.1 (441/10) (100Bq/ml), and the average of tumor diameter (mm) is 1.64, 1.67, 1.68, respectively.
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