CLARIFICATION OF HISTORY AND PREDICTION OF GLOBAL POLLUTION BY ULTRATRACE ELEMENTAL ANALYSIS OF ARCTIC ICE CORES-EFFECT OF NATURAL AND HUMAN ACTIVITIES

分析技术的最新进展使在北极冰芯中检测核爆炸释放的人工放射性核素成为可能。我们在加拿大埃尔斯mere岛的阿加西冰帽上收集了10个冰芯，测量了1945年长崎原子弹产生的裂变产物^<137>Cs和未消耗的裂变物质^<239+240>Pu （80.7 ^ on度）。假设放射性核素（不包括爆炸裂变和作为局部沉降物沉积的数量）均匀地沉积在整个北半球，预计到达北极的百分比为^<137>的铯为67%，^<239+240>的钚为1.1%。结果表明，不同的污染物（包括引起全球气候变化的火山灰）存在不同的全球大气输送机制。

Recent advancements in analytical technology made it possible for artificial radionuclides released from nuclear explosions to be detected in Arctic ice cores. We measured fission product ^<137>Cs, and unexpended fission material ^<239+240>Pu, from the Nagasaki A-bomb in 1945, in 10 ice cores collected on Agassiz ice cap, Ellesmere Island, Canada (80.7 ^ON degree). Assuming the radionuclides, excluding the amount fissioned from the explosion and deposited as local fallout, are deposited evenly throughout the northern hemisphere, expected percent that reached the Arctic was 67% for ^<137>Cs and 1.1% for ^<239+240>Pu. The results suggest that different global atmospheric transport mechanisms exist for various contaminants, including volcanic ash that induces global climate change.