Chapter 11, Problem 11.57AP

Interpretation Introduction

Interpretation:

The time taken by the sample of $\text{Selenium-75}$ to lose $\text{75\%}\text{and}\text{99\%}$ of its radioactivity has to be calculated.

Concept Introduction:

Half-life:

The time required to reduce a radioactive isotope to half of its initial value.

For non-integral number:

For a non-integral number of half-lives, the fraction of radioisotope remaining is

$\text{fraction}\text{remaining=}{\left(\text{0}\text{.5}\right)}^{\text{n}}$