加拿大曼尼托巴大学Ian Burron团队近日研究了冰川诱导放射性核素释放：对核废物地质处置的影响。2025年5月15日出版的《地质学》杂志发表了这项成果。

乏核燃料的深度地质处置需要了解放射性核素在10万年至100万年时间范围内的行为。Kiggavik铀矿床是核废料深地质处置的天然类似物，其新数据表明，氧化的冰下水可能会沿着断裂系统深注入地下，导致放射性核素动员有限。放射性核素迁移期对应于冰川期的气候变化，发生在大约36-471 ka的时间尺度上，与智人的进化相当。 

虽然氧化的冰下水可能对地质处置构成危害，但由此产生的铀运输速度比冰川运动慢数百万倍，而且是短程的（<5厘米）。通过预先存在的铀矿物和氧化钛的还原以及吸附到粘土矿物上，研究组有效地捕获了放射性核素。

附：英文原文

Title: Glaciation-induced radionuclide release: Implications for geological disposal of nuclear waste

Author: Ian Burron, Mostafa Fayek, Julie L. Brown

Issue&Volume: 2025-05-15

Abstract: Deep geological disposal of used nuclear fuel requires knowledge of how radionuclides behave over ～100 k.y. to 1 m.y. timeframes. New data from the Kiggavik uranium deposits, a natural analogue for deep geological disposal of nuclear waste, shows that oxidized subglacial waters may be injected deeply into the subsurface along fracture systems, resulting in limited radionuclide mobilization. Periods of radionuclide mobility correspond to episodes of climate change during glacial periods and occurred over ca. 36471 ka time scales comparable to the evolution of Homo sapiens. While oxidized subglacial waters may pose a hazard to geologic disposal, resulting uranium transport is millions of times slower than glacial movements and short-range (<～5 cm). Reduction by preexisting uranium minerals and titanium oxides and adsorption onto clay minerals have effectively trapped radionuclides.

DOI: 10.1130/G53021.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G53021.1/654345/Glaciation-induced-radionuclide-releaseredirectedFrom=fulltext