Japanese government has started to admit the actual contamination situation because of Fukushima little by little.
On 7/24/2012, Ministry of Education, Culture, Sports, Science and Technology published the data of strontium90. This measured has been done since before 311 monthly. The published data was taken from 4.2010 to 12.2011.
It’s been reported that strontium90 from Fukushima was measured in Fukushima and Miyagi. This data reported it was measured in 10 other prefectures as well,
Tokyo
Kanagawa
Chiba
Saitama
Tochigi
Gunma
Ibaraki
Yamagata
Iwate
Akita
MEXT states the highest reading was 6 Bq/m2 in Hitachinaka city Ibaraki, which was taken in 3.2011.
It was 1/2850 of cesium supposedly, which is harmless for health.
However, 195 Bq/Kg of strontium90 was detected in Yokohama. (cf. Breaking News: Measurement result of Strontium-90)
Iori Mochizuki