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专家释疑:菠菜中为何检测到放射物
发布时间:2011-04-11 02:54     来源:君健网
    卫生部6日宣布,从北京、天津和河南地区露天种植的菠菜中抽检发现微量放射性碘-131。7日,国家核事故应急协调委员会宣布,从江苏地区的莴笋叶、广东地区的莙荙菜抽检中也发现极微量的放射性碘-131。

  蔬菜检出碘-131的新闻引起人们的一些担心,记者就此采访卫生部核事故医学应急中心主任、中国疾病预防控制中心辐射安全所苏旭,专家表示,蔬菜中检测到的碘-131极其微量、对人体无害,目前无需采取任何防护措施。

  在解释食用此类蔬菜对人体有何影响、如何清除放射性污染物的问题时,苏旭表示,目前在蔬菜上检测到的放射性物质极其微量,每公斤蔬菜仅含有1至3贝克,有的仅为零点几贝克。实验结果显示,在不进行清洗的情况下每天食用1公斤这样的蔬菜,相当于天然本底辐射一天辐射剂量的千分之三左右。天然本底辐射对人体无害,因此无需采取任何防护措施。

  苏旭介绍说,目前在北京等地蔬菜样品上检测到的放射性碘-131极其微量,且属于表面附着而非进入蔬菜中。最新开展的相关实验结果证明,将受污染的菠菜放到清水中浸泡10分钟,清洗一两次以后,设备就检测不到放射性碘-131,不会对人体造成危害。

  “现在无需采取任何防护措施。”苏旭说,“在食用蔬菜前进行正常的清洗便可以清除放射性碘-131了,如果为了更安心,可以清洗三次。即使不清洗,从放射角度而言,也不会对身体产生危害。”

  至于为何在菠菜、莴苣叶等蔬菜中检测到放射性碘-131,以及未纳入监测目标、暂未发现放射性碘-131污染的蔬菜是否会受影响,苏旭这样解释:空气中的放射性物质沉降可污染地面和露天生长的蔬菜。菠菜露天生长、表面有微小绒毛,容易附着空气中沉降的放射性物质,选择此类蔬菜监测是为了及早发现问题、及时预警。

  “除了菠菜外,露天生长的其他蔬菜都可能受到污染,但一般都比菠菜的污染程度轻;大棚蔬菜则不会受到沉降物质的影响。而且,目前空气中放射性物质的浓度极其微小,沉降到地面和露天生长的蔬菜表面的放射性物质有限,公众无需担心。”苏旭说。

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