Samples of two radioactive nuclides,A ande B,each have equal activity Ao at time t=0.A has a half-life of 9 years and B has a half-life of 15 years.The samples are mixed together.
What will be the total activity of the mixture at t=45 years
2007-05-25 08:07:00 · 1 個解答 · 發問者 Kar Him 1 in 科學 ➔ 其他：科學
Consider A:
No. of half-lives = 45/9 = 5
Activity = Ao(1/2)5 = 0.03125Ao
Consider B:
No. of half-lives = 45/15 = 3
Activity = Ao(1/2)3 = 0.125Ao
Total activity
= 0.03125Ao + 0.125Ao
= 0.15625Ao
2007-05-25 08:30:35 · answer #1 · answered by Uncle Michael 7 · 0⤊ 0⤋