They said the low dosages of radiation workers were exposed to also underlined the priority given to safety.
The annual total radiation exposure for nuclear workers in Japan is 250 milliseiverts (raised from 100 ms just after the earthquake).
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The Daiichi plant does expose its workers to more radiation than other plants, the regulatory documents show.
The International Atomic Energy Agency and the World Health Organization say 28 emergency workers died of radiation sickness in the immediate aftermath of the disaster.
Tepco's other plants also exposed their workers to higher doses of radiation than most other big Japanese operators.
Robots sent inside the buildings found levels of radiation that would make it impossible for workers to remain there for long periods.
Its workers were routinely exposed to more radiation than their counterparts elsewhere.
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Dr. Nakamura brushes aside charges of fraud, and says he has used the QRS machine to correctly measure the severity of radiation exposure in a group of Fukushima Daiichi workers.
In an instant he and two co-workers were hit by a wave of intense radiation.
On Friday, workers dumped more sandbags of zeolite, a radiation absorbing material, into the sea by Unit 3.
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Sunday morning came another gaffe, when Tepco admitted that three workers who been exposed to massive doses of radiation had not been forewarned.
The fear of lack of control and dreadful consequences overwhelm any sense of the abstract economic benefits of nuclear power, and images of workers in protection suits and news of elevated radiation levels in food and water further fuel antinuclear sentiment on a global scale.
Ten years after the explosion, a CNN team visited Chernobyl to ascertain the long-term effects of radiation exposure for those living near Chernobyl during the accident, for cleanup workers or "liquidators, " or for those who continued to live in areas that were classified as polluted.
Traces of radiation escaped at the time, but officials said there was no danger to workers or neighbors.
Two TEPCO workers were rushed to the hospital yesterday after radioactive water penetrated their radiation suits, burning their skin.
Tokyo Electric Power Co, which operates the plant, later allowed workers to re-enter after establishing there was no fire and that radiation level in the area had not risen.
Russian rescue workers are 39 miles away from the evacuation area and are not being exposed to abnormal radiation levels, EMERCOM said Tuesday.
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