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Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 hr and is a pure gamma emitter. Suppose that 200mg were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals?
1- One half life.
2- two half-lives
3- 18 hr
4- 30 hr

  • Chemistry -

    k = 0.693/t1/2
    ln(No/N) = kt
    No = 200 mg
    N = solve for this
    k from above
    t time i hours.

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