Iridium-192 has a half-life of 74 days. How long will it take for 75% of the isotope to decay?

Name: Iridium-192 has a half-life of 74 days. How long will it take for 75% of the isotope to decay?
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Question

Quizplus · Accepted Answer

The half-life of Iridium-192 is 74 days, meaning it takes 74 days for half of the isotope to decay. To decay 75%, it must go through two half-lives: 50% decays in the first 74 days, and then 50% of the remaining 50% (which is 25%) decays in the next 74 days, totaling 148 days.

Iridium-192 Has a Half-Life of 74 Days