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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.
Luckily, the more radioactively energetic something is, the less time it sticks around. This means the extremely lethal variety will only be radioactive for a few hours to a couple weeks. The less energetic variety can stick around for years. Some elements, like Plutonium, have a half-life of 25,000 years or more. While exposure to this type of radiation wonât immediately kill you, chronic long-term exposure can raise your risk of cancer and cause other health related problems.