Chapter 10, Problem 10.21E

Interpretation Introduction

Interpretation:

The effective half life period of barium-140 has to be given.

Concept Introduction:

Effective half-life period:

The effective half-life is the time required for the amount of a radioisotope in the body to be reduced to half its original amount.  It can be calculated using the formula,

  $\frac{\text{1}}{{\text{T}}_{\text{ef}}}\text{=}\frac{\text{1}}{{\text{T}}_{\text{b}}}\text{+}\frac{\text{1}}{{\text{T}}_{\text{p}}}$

Where ${\text{T}}_{\text{ef}}$ is the effective half-life period

${\text{T}}_{\text{b}}$ is the biological half-life period

${\text{T}}_{\text{p}}$ is the physical half-life period