Prefectures surrounding Fukushima have reported the detection of radioactive cesium exceeding the provisional safety limit from the beef from the cows.
From Yomiuri Shinbun (1:57AM JST 7/23/2011):
On July 22, Tochigi, Iwate, Miyagi, and Akita Prefectures [separately] announced that radioactive cesium exceeding the provisional safety limit (500 becquerels/kg) was detected from the meat from 6 cows shipped from their prefectures.
According to the Ministry of Health, Labor and Welfare and other government agencies, all 30 cows whose meat exceeded the provisional safety limit for cesium had been from Fukushima Prefectures. Now it is 36 cows from 5 prefectures.
Of the 6 cows, 3 were shipped from a cattle farm in Nasu Shiobara City in Tochigi Prefecture on July 10, and were processed into meat in Tokyo. The meat was tested on July 22, and 560 to 760 becquerels/kg of radioactive cesium was detected. The meat hasn't been sold in the market. The rice hay used as the feed was from nearby dairy farms in the same city, and the hay was left on the rice field even after the Fukushima I Nuclear Power Plant accident.
Iwate Prefecture investigated 80 cows suspected of being fed with the contaminated rice hay, and found the meat from one cow to contain 1,210 becquerels/kg of cesium. The cow was processed on June 30 in Tokyo, and the meat was sold in Kyoto City.
I, and many who have been looking at the radiation contour map created by Professor Yukio Hayakawa (volcanologist at Gunma University), shouldn't be surprised at the discovery of contaminated beef from Nasu Shiobara City in Gunma Prefecture, more than 100 kilometers away from the nuke plant. I circled the location in red in the map: