Chapter 18, Problem 60QAP

Interpretation Introduction

Interpretation:

The activity of tritium in Ci should be calculated.

Concept introduction:

Activity is defined as the product of rate constant and number of atoms. It is also defined as the rate of decay or expresses number of atoms decays in unit time.

The mathematical expression is given by:

$\text{A = }\lambda \text{N}$

Where, A = activity, $\lambda$ = decay constant and N = number of radioactive nuclei.

Activity can be expressed in following units:

1 Bq = 1 atom/s

1 Ci = 3.700 × 10¹⁰ atoms/s

The relation between half-life and decay constant is given by:

$\lambda \text{=}\frac{\text{0}\text{.693}}{{\text{t}}_{\text{1/2}}}$

Where, $\lambda$ = decay constant and ${\text{t}}_{\text{1/2}}$ = half-life