Internal radiation spreads far and wide in Japan, as if external one is not enough. Or I should say, "Now they are telling us", when it is too late. Many people already ate the meat from the meat cows that have been only discovered recently to have been fed with radioactive rice hay.
Even the Shinkansen bullet trains were instrumental in spreading the contamination.
JR Tokai announced that the beef from Asakawa-machi in Fukushima Prefecture was used in bento (lunch box) sold on Shinkansen (bullet train). Nothing left of the meat, so no way to test it.
The rice hay from Asakawa-machi has been found to contain the maximum of 97,000 becquerels/kg of radioactive cesium.
By the way, the highest level of radioactive cesium in the rice hay was found in Motomiya City in Fukushima Prefecture, and it was 690,000 becquerels/kg. Motomiya City is located about 57 kilometers west of Fukushima I Nuke Plant. No word yet on what happened to the meat cows that ate the rice hay there.
The government and government-sponsored scholars say there is no need to overly concerned even if you eat the beef that contains radioactive cesium far exceeding the hastily-set provisional safety limit. Just remember, they have no proof. Research on internal radiation is sketchy at best, and was outright prohibited particularly in Japan after the two nuclear bombs at the end of the World War II and after the Dai-Go Fukuryu Maru incident (Bikini Atoll Operation Castle Bravo).
(Well, that would be whole another post.)
From Asahi Shinbun (12:53AM JST 7/21/2011):
No test was conducted on the cow, and there is no way of knowing whether the beef contained radioactive cesium that exceeded the provisional safety limit.
JR Tokai Passengers (headquartered in Tokyo) announced on July 20 that the meat from the cow fed with the rice hay found with high radioactive cesium was used in bento (lunch box) sold on the Shinkansen bullet trains. 34 kilograms of beef from Asakawa-machi, Fukushima Prefecture was used in about 387 bento boxes, which were all sold.
The bento menus for which the beef in question were used are "Beef Sukiyaki" and "Beef Sukiyaki Onigiri (rice ball)". They were prepared in the company's factories in Tokyo and Nagoya, and were sold from June 17 till July 1 on the Tokaido Shinkansen, at JR stations (Tokyo, Shinagawa, Shin-Yokohama, Nagoya) and at a kiosk at the SCMAGLEV and Railway Park in Nagoya City.