#jishin_quake ソース:Why We May Not Learn Much New About Radiation Risks From Fukushima www.npr.org 06:00 pm March 24, 2011 When it comes to health effects from low radiation doses, scientists don’t know beans. To be more precise, doses below 100 millisieverts are in a gray zone. Safety standards — such as the one that limits drinking water exposure for infants to less than about 2 millisieverts — a