Ministry tries to justify withholding SPEEDI fallout forecast data from public Saturday, July 28, 2012 Japan Times http://www.japantimes.co.jp/text/nn20120728b7.html
[Excerpted]In a report published Monday, a government-appointed panel investigating the Fukushima meltdown crisis said the SPEEDI data could have better informed residents about when to evacuate.
The science ministry, which interviewed Yoshiaki Takaki, who was the science minister at the time the crisis started, and other officials as part of its analysis of the actions it took, or didn't, said it is "doubtful" it could have provided trustworthy information to the public. But its report added that "the significance of providing predictions cannot be denied."
The report also admitted the ministry "did not offer enough explanations and caused misunderstandings" regarding the upper limit of radiation acceptable in schoolyards.
The 3.8-microsievert-per-hour limit was set in order to not exceed 20 millisieverts of annual radiation exposure, in line with recommendations by the International Commission on Radiological Protection, the ministry said. ICRP-set annual radiation exposure thresholds in cases of emergency range from 20 to 100 millisieverts.
MAJIA HERE: I don't understand how 3.8 microsieverts an hour doesn't exceed 20 milllisieverts an hour: 3.8 X 24 = 91.2 a day X 365 = 33288 = 33 millisieverts a year.
A study of adults found that “For every 10 mSv of low-dose ionizing radiation, there was a 3% increase in the risk of age- and sex-adjusted cancer over a mean follow-up period of five years (hazard ratio 1.003 per millisievert, 95% confidence interval 1.002–1.004).[i]
If that is what this level does to adults, what does it do to children?
Furthermore, the people in Japan, especially Fukushima, are now drinking water and eating food contaminated with radiation.
Their exposure to 3.8 microsieverts an hour is just their external exposure.
[i] Mark J. Eisenberg, Jonathan Afilalo, Patrick R. Lawler, Michal Abrahamowicz, Hugues Richard, and Louise Pilote. Cancer risk related to low-dose ionizing radiation from cardiac imaging in patients after acute myocardial infarction. Canadian Medial Association Journal 183.4 2011, 430-436. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3050947/pdf/1830430.pdf