Chapter 19, Problem 16E

Interpretation Introduction

Interpretation:

The half life of technetium- $\text{99m}$ is given. Time taken by decay of technetium- $\text{99m}$ to reach $6.3\times {10}^{-3}\text{mg}$ is to be calculated.

Concept introduction:Decay constant is the quantity that expresses the rate of decrease of number of atoms of a radioactive element per second. Half life is defined as the time required for the number of nuclides to reach half of the original value.

To determine:The time taken by decay of technetium- $\text{99m}$ to reach $6.3\times {10}^{-3}\text{mg}$ .