Fukushima “worst nuclear disaster in history”? – with release of radioactive Cesium 137
The highest cesium-137 levels in some villages near Chernobyl were 5 million Bq/m2. If true, Fukushima has already released higher levels of Cesium 137 than Chernobyl, making it the worst source of nuclear radiation release in history…..If preliminary information is correct, Fukushima already is the worst nuclear disaster in history.
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Japan’s Government Needs to Move Quickly, THE HUFFINGTON POST, Daniel Wagner, 4 April 11, Daniel Wagner is managing director of Country Risk Solutions, a political risk consulting firm based in Connecticut, and senior advisor to the PRS Group. Why the Japanese Government Needs to Move Quickly The focus of much of the press since the quake and tsunami has been on levels of radioactive iodine that has been released into the environment, but cesium-137 is a much greater health concern and has been linked to cancer deaths nine times greater than radioactive iodine, with a half life of 30 years. Last week, for the first time, the Japanese science ministry began to release measurements of cesium-137 in soil around the plant.
The levels were highest from two points northeast of the plant, ranging from 8,690 becquerels/kilogram to a high of 163,000 Bq/kg measured on 20 March from a point about 40 kilometers northwest of the Fukushima plant. The hottest spot is similar to levels found in some areas affected by Chernobyl. Assuming the measurement is no more than 2 centimeters deep, nuclear engineer Shih-Yew Chen of the Argonne National Laboratory calculates that 163,000 Bq/kg is roughly equivalent to 8 million Bq/m2. The highest cesium-137 levels in some villages near Chernobyl were 5 million Bq/m2. If true, Fukushima has already released higher levels of Cesium 137 than Chernobyl, making it the worst source of nuclear radiation release in history.
Given this, the Japanese government must now move quickly to stop the release of radiation from the Fukushima plants. If preliminary information is correct, Fukushima already is the worst nuclear disaster in history. It could become much worse by degrees if the Japanese government hesitates to use every resource at its disposal — including that of the IAEA and foreign governments — to solve the problem. In the absence of admitting the severity of the problem and acting with haste, Japan’s economy and its people face potentially grave consequences, and the northeast Asia region faces unknown consequences from the release of high levels of cesium-137……
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“…Assuming the measurement is no more than 2 centimeters deep, nuclear engineer Shih-Yew Chen of the Argonne National Laboratory calculates that 163,000 Bq/kg is roughly equivalent to 8 million Bq/m2….”
The soil density is about 1.6 kg/dm3. In this case the Cs137 inventory in 2 cm of soil with 163kBq/kg is about 5.2MBq/m2 and not 8MBq/m2 as you wrote.