Chapter 19, Problem 44E

Interpretation Introduction

Interpretation:

Half life of I- $131$ is given. Assuming that none of the I- $131$ is eliminated from the person’s body in the first $\text{4}\text{.0}\text{hours}$ of treatment, the amount of exposure (in Ci) during the first four hours of treatment 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 amount of exposure (in Ci) during the first four hours of treatment.