Krypton-85 (Kr-85) is a radioactive isotope of the element krypton, which is a noble gas. It has a mass number of 85, meaning it has 36 protons and 49 neutrons in its nucleus. Krypton-85 is produced naturally in the atmosphere through the interaction of cosmic rays with stable krypton isotopes and is also released into the environment from certain human activities, primarily from nuclear reactors and radiological applications.
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