Question

     The radioactive element most commonly detected in

    humans is?
    A cobalt-60 Correct Answer Incorrect Answer
    B potassium-40 Correct Answer Incorrect Answer
    C plutonium-238 Correct Answer Incorrect Answer
    D iodine-131 Correct Answer Incorrect Answer

    Solution

    Potassium-40 is the largest source of natural radioactivity in animals including humans. A 70 kg human body contains about 140 grams of potassium 40.

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