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

Name: Krypton-85 has a half-life of 10 years. Identify the percentage of Kr-85 produced from the Chernobyl accident in 1986 that still remains radioactive in 2010.
Brand: Quizplus
Rating: 4.9 (56 reviews)

Question

Quizplus · Accepted Answer

From 1986 to 2010 is 24 years, which is 2.4 half-lives of Kr-85 (10 years per half-life). The remaining amount is (1/2)^(2.4) ≈ 0.25 or 25%.

Krypton-85 Has a Half-Life of 10 Years