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Plutonium-238 has a half-life of 88 years and emits alpha particles. It is a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft.
Po-210 emits alpha particles and is 5,000 times more radioactive than radium. The half-life of Po-210 is 138 days. Alpha radiation delivers a large amount of energy to living cells and can cause considerable damage and cell death.olonium-210: basic facts and questions. The investigation of the polonium poisoning case in United Kingdom has brought attention to the radioactive material Polonium-210 (Po-210) as a possible public health concern.