In 1983 a group of 180 apartment buildings was completed in Taiwan. Somebody had made a serious mistake. They had mixed into the concrete a considerable amount of highly radioactive cobalt 60. This meant that ultimately 10,000 people lived in buildings for from 9 to 20 years so radioactive that they received an average of 74 mSv of radiation per year in 1983, declining thereafter as cobalt 60 has a half life of 5 + years. This compares with a rate of 0.5 mSv above background which is the normal maximum exposure for radiation workers & total of 15 mSv maximum safe limit for land fit for habitation according to US government standards. ...A thorough & methodical tracing of all the 4,000 families by a team led by W. L Chen of Taiwan's Director of Medical Radiation Technology of Taiwan's National Yang-Ming University (the full report is available in English on www.jpands.org ) has resulted in an unequivocal & spectacular result. Cancer rates in that highly radioactive building are down to 3.6% of prevailing Taiwanese rates. This study...has such well-defined boundary conditions & in proving a reduction in cancers of 96.4% has such a clear result that there can no longer be any intellectual doubt whatsoever. Radioactivity, up to 50mSv, is good for us.

Hiroshima did not appear to fit the predicted scientific pattern, and there are places in India & Iran with background radiation of 15mSv or higher with no observed increase in cancer... So perhaps beneficial mutations are also possible?

Source: Pravda