Phosphorous-32 has a half-life of 14.3 days while radon-222 has a half-life of 3.8 days,so phosphorous-32 is considered more active.

Question

Quizplus · Accepted Answer

The activity of a radioactive isotope is determined by its decay rate, not directly by its half-life. A shorter half-life, like that of radon-222, indicates a faster decay rate, making it more active in terms of radioactivity compared to phosphorous-32 with its longer half-life.

Phosphorous-32 Has a Half-Life of 14