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Krypton is used in different forms for many applications in the medical industry. Krypton lasers are commonly employed for laser eye surgery. The laser is used to help prevent blood clotting in the eye as surgery is performed.
Because it can form compounds with fluorine, krypton is also used in krypton-fluoride lasers. Recently, a new use was found for isotopes of Krypton. Radioactive isotopes can be used to date matter on earth because they decay over time at a predictable rate. You have probably heard of radiocarbon dating.