Suppose that 10 units of beryllium are present in a living organism and that the half-life of beryllium is 4.6 million years. Find the age of a fossil if 20% of the original radioactivity is present when the fossil is discovered.

Suppose that 10 units of beryllium are present in a living organism and that the half-life of beryllium is 4.6 million years. Find the age of a fossil if 20% of the original radioactivity is present when the fossil is discovered.

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter19: The Nucleus: A Chemist's View

Section: Chapter Questions

Problem 6Q

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Question

Example 6. Fossil dating
Radioactive beryllium is sometimes used to date fossils
found in deep-sea sediment. The amount
of radioactive material x satisfies
dx/dt = kx.
Suppose that 10 units of beryllium are present in a
living organism and that the half-life of beryllium
is 4.6 million years. Find the age of a fossil if 20% of
the original radioactivity is present when the fossil is
discovered.

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