ISRN Estimates Quantity Of Cesium 137 Spilled Into Ocean At Fukushima 20X TEPCO's Total

[hatrack]

フランス政府系の放射線防護原子力安全研究所（ＩＲＳＮ）は２７日、東京電力福島第１原発事故後の３月２１日から７月半ばまでに海に流出した放射性セシウ ム１３７の総量は２．７１京ベクレル（１京は１兆の１万倍）で、東京電力が６月に発表した推計値の２０倍に達すると推定した調査報告書を公表した。

On October 27, the Institute for Radiological Protection and Nuclear Safety (IRSN, Institut de Radioprotection et de Surete Nucleaire) of France announced its research report in which the researchers estimated the total amount of radioactive cesium-137 leaked from Fukushima I Nuclear Power Plant into the ocean was 27,100 terrabecquerels from March 21 to mid July. The IRSN estimate is 20 times as much as the estimate announced in June by TEPCO.

　単独の事故によるものとしては過去最大規模という。このうち８２％は、事故が起きた原子炉を冷やすための放水によって４月８日までに流れ出たとされる。

According to IRSN, it is the largest amount of radiation leak in a single accident. 82% of the leak took place by April 8, because of the spraying of water to cool the reactors.

The research paper (in French) is here.

EDIT

http://ex-skf.blogspot.com/2011/10/frances-irsn-new-estimate-on-amount-of.html

[kristopher]

1. The estimate for airborne emissions has also increased dramatically

Fallout levels twice estimate: study
AP NEW YORK — The Fukushima nuclear accident released double the amount of cesium-137 into the atmosphere than the government initially estimated, reaching 40 percent of the total emitted during the Chernobyl disaster, a preliminary report said.

The estimate of much higher levels of cesium-137 comes from a worldwide network of sensors. Report coauthor Andreas Stohl, of the Norwegian Institute for Air Research, said the government estimate came only from data in Japan and didn't include emissions blown out to the Pacific Ocean.

Cesium-137 is considered harmful because it can remain in the environment for decades, releasing cancer-causing radiation. The report did not consider the health implications of the emissions....

http://www.japantimes.co.jp/text/nn20111029a5.html