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OpenStudy (mintiemee):
Which of the following radioisotopes is naturally occurring?
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OpenStudy (mintiemee):
OpenStudy (whpalmer4):
The problem's author undoubtedly expects you to choose only 1 answer. However, at least two of these radioisotopes occur naturally (in very small quantities). Cosmic rays colliding with hydrogen in the atmosphere produce small quantities of tritium, and U-238 atoms can produce Pu-238 by double beta emission.
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