The "impressive, well-organized" (according to IAEA) Japanese government disclosed that the Ministry of Education and Science made a calculation error, and the cumulative radiation level from March 12 to May 11 at a location in Namie-machi in Fukushima Prefecture was 61 millisieverts, not 31 as had been previously announced.
The cumulative radiation level at the location in Namie-machi up to May 25 was 73.9 millisieverts.
Oh wait.. The cumulative radiation increased 13 millisieverts in 2 weeks? That's over 20% increase.
Is it only for the Namie-machi numbers that the Ministry made a calculation error?
From Tokyo Shinbun, citing Kyodo News (9:42PM JST 6/3/2011):
The Ministry of Education and Science announced on June 3 that the estimated cumulative radiation level from March 12 to May 25 at one location in Namie-machiFukushima Prefecture, 22 kilometers northwest of Fukushima I Nuke Plant, was 73.9 millisieverts. The Ministry also disclosed the cumulative radiation estimate map of the same period in the area around Fukushima I Nuke Plant.
Previously, the Ministry of Education and Science announced the cumulative radiation at this particular location up to May 11 was 31.7 millisieverts, but it corrected the number to 61.1 millisieverts. According to the person [unnamed] in charge at the Ministry, "A wrong formula was used in calculation in some parts." Calculation errors were found for 10 additional locations within Namie-machi, resulting in a vast underestimation of the radiation levels.
By the way, the video of a cute, ear-less rabbit was taken at a Namie-machi location. It was not a hoax, and it was later reported by a major newspaper (Sankei Shinbun). The person who uploaded that video said in the Youtube description that the cumulative radiation level in Namie-machi had been much higher (as measured by the residents) than the Ministry's number, up to 3 times as much. Well, Namie residents were right.