Chapter 20, Problem 92RQ

Interpretation Introduction

Interpretation:

The decay constant and half-life in seconds for thallium-201 $\left({}^{201}\text{Tl}\right)$ are to be calculated when a 10.0 mg sample has an activity of $7.9\times {10}^{13}\text{Bq}$.

Concept Information:

Thallium-201(²⁰¹Tl) is the most useful radioisotope. Thallium-201 is useful in cardiac stress tests. The number of atoms fractions that decay in one second is called decay constant. The time required to reduce a quantity to half of its initial value is called half-life.