美两州饮用水中发现极微量人工放射性核素碘

happylux

2011年04月05日 15:39　来源：新华网　

美国环保署4日晚发表监测报告说，美国西北部两个州的饮用水中发现极微量的人工放射性核素碘-131，但对公众健康没有威胁。这是日本核泄漏事件后美国饮用水中首次监测到碘-131。

　　美国环保署当天公布了RadNet监测网的最新数据。数据显示，爱达荷州的博伊西以及华盛顿州里奇兰的饮用水样品中发现碘-131，辐射剂量约为每升水0.0074贝克勒尔。

　　美国环保署表示，目前不必担忧饮用水中发现碘-131，因为“一名婴儿饮用差不多7000升这样的水后受到的辐射剂量，才与每天从自然环境中受到的辐射剂量相当”。

　　美国环保署在全国各地的监测站组成了名为RadNet的监测网。这一监测网分为10个分区，覆盖了美国所有州，主要工作是搜集各地的大气、降水、饮用水以及牛奶样品，分析其中的放射物水平。日本发生核泄漏事故以来，美国环保署根据RadNet监测网的分析数据，及时在网站显要位置发布各地是否发现放射物的信息。


　　美国环保署预计，今后几周将持续在各地饮用水中发现放射物。

wxp

EPA的官网上确实有发布。

数值本身很低，还不值得恐慌啦。不过要不是因为能飘到本土来，老美哪会送自己人去福岛照辐射

http://yosemite.epa.gov/opa/admp ... 48D8525786900020035
EPA STATEMENT: Update on Ongoing Monitoring

Release date: 04/04/2011

Contact Information: EPA Press Office, press@epa.gov



WASHINGTON – As a result of the incident with the Fukushima nuclear plant in Japan, several EPA air monitors have detected very low levels of radioactive material in the United States consistent with estimated releases from the damaged nuclear reactors. EPA has stepped up monitoring of precipitation, milk, and drinking water in response to the Fukushima events. The detections in air, precipitation, and milk were expected, and the levels detected have been far below levels of public-health concern.

Today, EPA released its latest RadNet results, which include the first results for drinking water. Drinking water samples from two locations, Boise, Idaho and Richland, Washington, showed trace amounts of Iodine-131 – about 0.2 picocuries per liter in each case. An infant would have to drink almost 7,000 liters of this water to receive a radiation dose equivalent to a day’s worth of the natural background radiation exposure we experience continuously from natural sources of radioactivity in our environment.

Earlier precipitation samples collected by EPA have shown trace amounts of radioactivity, so EPA has expected to find results such as these in some drinking water samples. Similar findings are to be expected in the coming weeks.