The guideline sets the lifetime permissible levels of space radiation, such as protons and baryons from the sun, at 600 to 1,200 millisieverts
for astronauts, depending on their sex and age at the time of their first space flight.
According to TEPCO, it detected radiation exceeding 1,000 millisieverts
Radiation above 250 millisievert
is said to cause health problems such as a
While the amount of radiation outside the plant, measured in microsieverts and millisieverts
, is small, dosages are cumulative.
The Japanese environment ministry had released an estimate last month that over 960 square miles, or 2,400 square kilometers, of land would have to be decontaminated to achieve an annual radiation exposure limit of five millisieverts
Although he said that the radiation was considerably higher than typical annual natural doses of around one millisievert
, the Newsciesntist quoted him as saying that: "These sort of levels pose a pretty small additional risk.
s Oi plant in Fukui Prefecture and Tokyo Electric's Fukushima Daini plant in Fukushima Prefecture may also see radiation doses reach 100 millisieverts
Tokyo, June 27 (ANI): Over three millisieverts
of radiation has been measured in the urine of 15 residents living near the Fukushima Daiichi Nuclear Power Plant, especially in the village of Litate and the town of Kawamata.
Radiation doses could also reach 100 millisieverts
in locations a little more than 30 km away from Chubu Electric Power Co.
The radiation readings were up to 4,000 millisieverts
per hour at the building, the TEPCO said.
TEPCO uses the dosimeters to decide how long staff at the Fukushima plant can work without exceeding the government-set exposure limit of 100 millisieverts
Tokyo, May 1 (ANI): Tokyo Electric Power Corporation (TEPCO) has said a second female employee has been exposed to radiation exceeding the legal limit of five millisieverts
at the earthquake-cum-tsunami hit the Fukushima Daiichi nuclear power plant.