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日本再发生核泄漏事故 多人遭受严重辐射

2017-06-09 08:08:01   新华社

图为位于日本茨城县大洗町的日本原子能研究开发机构“大洗研究开发中心”

日本原子能研究开发机构5名工作人员6日检查核废料时发生意外,吸入大量放射性粉末,其中一人体内辐射水平惊人,今后罹患癌症等疾病风险大大增加。

这是日本迄今最严重的一起体内辐射事故,发生泄漏的容器是26年来首次接受安全检查。日本媒体说,频频发生的事故再次暴露作为国立机构的原子能机构在核物质管理上的混乱。

【包装破裂引发泄漏】

6日上午,原子能机构位于茨城县的大洗研发中心的5名员工按计划对21个存有核废料的容器进行检查。当5人打开第一个容器时,内部包裹着核废料的双层塑料袋突然破裂,约300克放射性铀、钚飞散开来,被这些员工吸入。

据原子能机构检测,其中一名50多岁男性员工吸入大量放射物质,仅肺部就检出2.2万贝克勒尔钚-239,全身放射性物质含量估测高达36万贝克勒尔。

这相当于1年内遭受1.2希沃特的辐射。《朝日新闻》援引对广岛、长崎两地原子弹爆炸幸存者的调查说,一般来说,人体遭受的辐射量超过0.1希沃特,罹患癌症的风险就会明显增加,而这名男子体内辐射量超过这一界限的十倍以上。

不同于外部辐射,吸入体内的放射性物质会附着在肺部或溶解在血液中,现阶段无法通过药物完全排出体外,这些放射性物质常年累积体内,其发出的放射线损害体内器官机能,增大癌症发病几率。

日本量子科学技术研究开发机构负责人明石真言7日直言:“据我们所知,这种程度的体内辐射算是比较高的。这样的数字是第一次。”

量子科技研发机构是日本专门研究辐射的国立研究机构。明石告诉媒体记者:“遭受辐射的工作人员今后癌症发病风险增加是很明确的,需要长期观察辐射对身体健康的影响。”

除了这名50多岁的员工,另外3名员工肺部也检测出放射性物质,余下一人遭受体内辐射的可能性也很大。

【管理混乱再次出事】

事故发生后,原子能机构召开新闻发布会时解释称“操作程序符合要求,作业人员的装备也不存在问题”,只是“没有想到塑料袋会破裂”。但这一说法并未平息舆论的批评。

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