1.28 uSV = 0.13 mR
.13 mR/Hr = 1.13 R/Year or about 3x your normal yearly dose from all sources. Or 20% of the maximum allowable amount for a radiation worker.
That’s a pretty low level to be considered a High Radiation Area.
These are children. According to the National Academy of Sciences Biological Effects of Ionizing Radiation (VII) report, children are more sensitive to radiation (rapidly dividing cells)compared with adults. Also according to the BEIR VII, there is no safe threshold and even small doses of radiation contribute increased cancer risk so 3 times the amount of background radiation each year is bad news for anyone but even worse for children. Then multiply up for the number of years they are exposed. Not good.
Furthermore, the testing performed by the city (as well as Japanese gov. officials) typically measures cesium but does not test for strontium, uranium, or any of the other 31 isotopes that the IAEA reported present at Fukushima fallout areas. Furthermore, this unfortunately is only a measure of external dose whereas school children have been served Fukushima produce and beef (and publicly ridiculed for not drinking radioactive milk) in schools which later proved to be contaminated as well. Then factor in drinking water and air...the total dose these children are receiving is unknown. It’s just really sad to see photo opportunities (mail box cleaning) highlighting a carelessness toward the most vulnerable members of society - the ones with futures in jeopardy.