Krypton-85 has a half-life of 10 years. Approximately what percentage of Kr-85 produced from the Chernobyl accident in 1986 still remains radioactive in 2010?

Name: Krypton-85 has a half-life of 10 years. Approximately what percentage of Kr-85 produced from the Chernobyl accident in 1986 still remains radioactive in 2010?
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From 1986 to 2010 is 24 years. In 24 years, approximately 2.4 half-lives have passed (24/10). After 2.4 half-lives, about 25% of the original Krypton-85 would remain.

Krypton-85 Has a Half-Life of 10 Years