Western Australian authorities are scrambling to find a missing radioactive capsule that is a fraction of the size of a 10c coin, conceding it was not found missing until more than two weeks after it left a Rio Tinto mine site.
The 8mm by 6mm capsule is a 19-becquerel caesium 137 ceramic...
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When Dr. Ian Crozier arrived in West Africa this past summer, he was stepping into the epicenter of the Ebola hot zone. The American doctor was working in the Ebola ward of a large, public hospital in Sierra Leone's dusty city of Kenema.
The trip nearly cost him his life. First came a fever...
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Health officials say a second, more serious outbreak of Ebola in Mali started about two weeks ago, when a clinic made a mistake while treating a grand imam.
Doctors at the Pasteur Clinic in Bamako, Mali's capital, diagnosed the imam with kidney failure and never bothered to test him for...
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The recent 9.0-magnitude quake and tsunami in Japan triggered a number of explosions at the Fukushima No. 1 nuclear power plant, which caused the worst nuclear crisis since Chernobyl in 1986.
The radiation levels in the building exceed expected levels reaching as high as 700 millisieverts per...
How much radiation is dangerous?
Radiation is measured using the unit sievert, which quantifies the amount of radiation absorbed by human tissues. One sievert is 1,000 millisieverts (mSv).
In the U.S., the average person is exposed to about 6.2 millisieverts a year, mostly from background...