Chapter 9, Problem 9.29UKC

(a)

Interpretation Introduction

Interpretation:

The balanced nuclear reaction for the positron emission of Arsenic-74 has to be given.

Concept Introduction:

Positron emission reaction:

Positron particles are positrons (electrons with positive electric charge). Positron decay occurs when in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other.

  ${{}_{\text{Z}}}^{\text{A}}\text{X}{\stackrel{}{\to }}_{\text{Z-1}}{}^{\text{A}}{\text{X+}}_{\text{+1}}{}^{\text{0}}\text{e}$

(b)

Interpretation Introduction

Interpretation:

The amount of samples remains after 90 days has to be given.

Concept Introduction:

Half-life:

The half-life of a radioactive substance is a measure of time taken for a given amount of the substance to reduce as an effect of decay.

(c)

Interpretation Introduction

Interpretation:

The volume of arsenic-74 administered has to be given.