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Cosmos 954Cosmos 954 was a Soviet Radar Ocean Reconnaissance Satellite (RORSAT) with an onboard nuclear reactor. The satellite's reactor core failed to separate and boost into a nuclear-safe orbit, and instead remained onboard in an orbit that decayed until the satellite reentered Earth's atmosphere January 24, 1978. The satellite crashed near the Great Slave Lake (in the Northwest Territories, Canada), spreading its radioactive fuel over a 124,000 km² (48,000 mile²) area. Subsequent recovery efforts by a joint American-Canadian team swept the area by foot and air until the fall ice breakup in October made further searches impractical. They were ultimately able to recover 12 larger pieces of the satellite. These pieces displayed radioactivity of up to 1.1 sieverts per hour, yet they only comprised an estimated 1% of the fuel. For these recovery efforts, the Canadian Government billed the Soviet Union $15 million. Though the U.S.S.R. paid less than half of that amount, many were surprised that they even acknowledged that a satellite had crashed. See also
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