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The direct cause was the over-withdrawal of the central control rod, responsible for absorbing neutrons in the reactor's core. The event is the only reactor accident in U.S. history that resulted in immediate fatalities.The accident released about 80 curies (3.0 TBq) of iodine-131, which was not considered significant due to its location in the remote high desert of eastern Idaho. About 1,100 curies (41 TBq) of fission products were released into the atmosphere.