Fukushima Diary reported the atmospheric is the highest in Tochigi before.
(cf. The highest atmospheric dose is in Tochigi (Apart from Fukushima))
31,000 Bq/Kg of cesium134/137 was measured from mushroom in Tochigi. The measurement was done by Ministry of Health, Labour and Welfare, published on 8/6/2012. (cf. Cesium from 60% of fishery products in Fukushima)
Sample : Wild lactarius volemus
Sample taken : 8/3/2012
Place : Nikko city Tochigi
Cs134 : 12,100 Bq/Kg
Cs137 : 19,000 Bq/Kg
According to Ordinance of the Ministry of Economy, Trade and Industry No.112 [Link], radioactive material to contain more than 100 Bq/kg of Cs-134/137 must be properly stocked to not to cause public radiation hazard.
When you see this 19,000 Bq/Kg of Cs-137, the contamination level of this product is almost 190 times higher than the safety limit.