Which characteristics of a radioisotope make it useful for diagnosing medical problems?

A useful diagnostic radioisotope should be taken up by a specific part of the body so its radiation can help show that organ or tissue. It should also have a short half-life, so it decays quickly and limits the patient’s exposure to radiation. Therefore, the correct choice is “a short half-life and it is taken up by a specific part of the body.”

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