Thursday, November 17, 2011

A Radioisotope Of Ytterdium Having Half-life Of 3.00 Days, Is Administered To A Patient For Treatment Of Brain?

396545116 need this as soon as possible thank you.
cancer. calculate the time by which 40.0 micrograms falls to 16% of initial value in the body
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  1. rebesNovember 17, 2011 at 6:02 AM

    Zarn - And I need a complete question as soon as possible thank you. As it sits right now, there's a crucial element missing - the question.

    Ah, a half-life question? Well, that's simple, really.

    0.16 = 1 * (1/2)^(t/3)
    ln 0.16 = (t / 3) ln (1/2)
    3*(ln 0.16 / ln (0.5) = t
    t = 7.93, or approximately 8 days.

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