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Radon Rn Radium RaUranium U. Radionuclides. Radioactive Element in the Uranium 238 decay seriesDecay product of Ra 226Alpha emitterHalf life of 3.8 days. Radon - 222. Rn 222 3.8 daysPo 218 3 minPb 214 27 minBi 214 20 minPo 214 1.6x10-6 secPb
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