That's the conclusion of the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). TEPCO and the Japanese government have said as much already.
Yomiuri Shinbun reports (5/24/2012):
The United Nations Scientific Committee on the Effects of Atomic Radiation (Secretariat in Vienna) has been studying the effect of radiation from the Fukushima I Nuclear Power Plant accident on the environment and humans. The Committee announced its initial evaluation on May 23 that even though 6 workers have died since the start of the accident, the deaths have nothing to do with radiation exposure".
The initial assessment was announced as the statement from Committee Chairman Wolfgang Weiss. As to the worker from a TEPCO affiliate company in his 40s who died of acute leukemia in August last year, UNSCEAR said, "The time was too short between the start of the work and his death, so there was no causal relationship between the death and radiation exposure."
The Committee will conduct further analysis, and will submit its report to the United Nations General Assembly by the end of next year.
UNSCEAR's statements are as follows:
UNSCEAR's annual meeting started on May 21 in Vienna, and will last till May 25.
Committee Chairman Weiss says in the press release:
"We have been given information about measurements made on the thyroids of over 1,000 children in Iitate village, Kawamata town and Iwaki city," said Weiss. "Also, a survey in Fukushima prefecture is aiming to evaluate irradiation levels for some 2 million people living in the prefecture at the time of the accident. The results of the UNSCEAR assessment for these areas will be compared with the Japanese measurements and analysis, and any differences will be highlighted and addressed," said Weiss.
The backgrounder for the press makes it clear that UNSCEAR will have to rely on the data to be further submitted by the Japanese government, particularly regarding the radiation dose assessment of the general public in Fukushima. To further assess the dose for the Fukushima I Nuke Plant workers, it will have to rely on the data from TEPCO. To assess the impact of radiation on the environment, all it has had so far is only a small number of published studies.
For the past year, the Japanese government has been busy telling the world everything is fine, nothing to worry about, Japan has recovered from the disaster (by which they mostly mean the earthquake and tsunami, and it is not really true). They seem to have taken their own words too literally and it seems they have neglected to collect data on radiation. Oh well. Until next time, I suppose.