Radioactive cesium was detected in 51 food products from nine prefectures in excess of a new government-set limit in the first month since it was introduced April 1, according to data released by the health ministry Tuesday.
The limit was exceeded in 337 cases, or 2.4 percent of 13,867 food samples examined by the Health, Labor and Welfare Ministry.
Cesium exceeding the previous allowable limit of 500 becquerels per kilogram was detected in 55 cases, while the new limit of 100 becquerels was exceeded in 282 cases.
By prefecture, there were 142 cases in Fukushima, 69 in Tochigi, 41 in Ibaraki, 35 in Iwate, 32 in Miyagi, 13 in Chiba, two each in Yamagata and Gunma, and one in Kanagawa.
Mushrooms and other agricultural products containing cesium in excess of the tougher limit were involved in 178 cases, while 156 cases pertained to fishery products such as flat fish and bass. In addition, two cases involved black bear meat and one case fried “moroko” fresh water fish.