EPA boosts radiation monitoring after low levels found in milk

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http://www.cnn.com/2011/HEALTH/03/31/radiation.us/index.html?hpt=T2

Washington (CNN) -- The U.S. Environmental Protection Agency is increasing its nationwide monitoring of radiation as two states reported very low levels of radiation in milk.
The agency said Wednesday it is boosting its monitoring of radiation in milk, precipitation, drinking water, and other outlets. It already tracks radiation in those potential exposure routes through an existing network of stations across the country.
Results from screening samples of milk taken in the past week in Spokane, Washington, and in San Luis Obispo County, California, detected radioactive iodine at a level 5,000 times lower than the limit set by the U.S. Food and Drug Administration, officials said.
The I-131 isotope has a very short half-life of about eight days, the EPA said, so the level detected in milk and milk products is expected to drop relatively quickly.
FDA senior scientist Patricia Hansen also said the findings are "miniscule" compared to what people experience every day.
Washington Gov. Chris Gregoire said tests confirmed the milk is safe to drink.
"This morning I spoke with the chief advisers for both the EPA and the FDA and they confirmed that these levels are miniscule and are far below levels of public health concern, including for infants and children," Gregoire said in a statement.
"According to them, a pint of milk at these levels would expose an individual to less radiation than would a five-hour airplane flight."
Similarly, the California Department of Public Health reassured residents that the levels do not pose a threat.
"When radioactive material is spread through the atmosphere, it drops to the ground and gets in the environment. When cows consume grass, hay, feed, and water, radioactivity will be processed and become part of the milk we drink. However, the amounts are so small they pose no threat to public health," the department said.
At least 15 states have reported radioisotopes from Japan's crippled Fukushima Daiichi nuclear plant in air or water or both. No states have recommended that residents take potassium iodide, a salt that protects the thyroid gland from radioactive iodine.
Iodine-131 has been found in eastern states from Florida to Massachusetts as well as in western states like Oregon, Colorado, and California, according to sensors and officials in those states.
None of the levels poses a risk to public health, they said.
The Japanese plant has been leaking radiation since it was damaged in the earthquake and resulting tsunami earlier this month.
 
辐射跟核辐射不是一个概念吧?懂行的给科普一下。
 
都差不多是那些射线吧,就是产生射线的方式不一样,计量大小不一样?
 
Iodine-131 不就是最开始日本核电站爆炸后泄漏出来的其中一种放射物质。好像是核裂变后的一种产物。大家疯狂买碘片也就是为了防这个。现在日本东北部地区很多的蔬菜和牛奶应为测到Iodine-131超过他们国家的标准而不能出售。不过咱们这边应该没事吧。要有也是极其极其微量的。
 
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