When aboveground nuclear tests were conducted, the explosions shot radioactive d

Question

When aboveground nuclear tests were conducted, the explosions shot radioactive dust into the upper atmosphere. Global air circulations then spread the dust worldwide before it settled out on ground and water. One such test was conducted in october 1976. What fraction of the 90sr produced by that explosion still existed in october 2008? The half-life of 90Sr is 29 y. Number Units Question Attempts: Unlimited Copyright 2000-2017 by John Wiley & Sons. Inc. or related companies. All rights reserved

Explanation / Answer

t = 2008 - 1976 = 32 years

half life, T = 29 years

For radioactive decay:

N = No 2^-(t/T)

N/No = 2^(-32/29) = 0.465 ......Ans

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.