Chapter 14, Problem 14.18PAE

Interpretation Introduction

Interpretation:

The half-life of a radioisotope that decays to 12.5 % of its radioactivity in 12 years should be calculated.

Concept introduction:

• The rate at which a radioactive sample decays is called an activity of a sample.
• Half-life is the time required for one half of a sample to disintegrate.