Most stable radio-isotope among the following –

Correct Answer: O –18
Description: O-16,O-17, O -18 are stable radioisotopes of oxygen. C-12, C-13, are stable radioisotopes of carbon (not C-14). P-31, is stable radioisotopes of phosphorus (not P-32). 1-125 is radioactive form of iodine (not stable).
Category: Radiology
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