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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.
Kryptonite is a transuranic element or compound (we are never told which for certain) whose inherent radioactivity inhibits the absorption of high-energy solar radiation which Kryptonians use to power their feats of superhuman ability.