Question

For the isotope yttrium-91 (Z=39), the half-life is 58.5 days. What percentage of an initial sample of yttrium-91 remains after 145 days?

Next question: A patient receives an absorbed dose of 0.120 mGy from the neutron radiation with a relative biological effectiveness of 18.0. What is the dose equivalent? Note: mGy=1.0 x 10^-3 Gy and 1.0mSv= 1.0 x 10^-3 Sv

Answer 1

The concept used in this question is of relationship between half-life and decay constant , after applying this concept i deduced the value.

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