Chapter 9.3, Problem 9.4PP

(a)

Interpretation Introduction

Interpretation:

Amount of sodium-24 that remains after $\text{2}\text{.5}\text{d}$ has to be calculated if the initial quantity taken was $\text{100}\text{ng}$.

Concept Introduction:

With the knowledge of the initial mass of radioactive sample and the half-life of the radioisotope, the mass of the radioactive sample that remains after a period can be calculated using the equation given below,

    $m_f=m_i{(0.5)}^n$

Where,

    $m_f$ is the final mass of the sample or remaining mass of sample.

    $m_i$ is the initial mass of the sample.

    $n$ is the number of half-lives.

(b)

Interpretation Introduction

Interpretation:

Amount of technetium-99m that remains after $\text{1}\text{d}$ has to be calculated if the initial quantity taken was $\text{10}\text{ng}$.

Concept Introduction:

Refer part (a).