# Rates of Radioactive Decay

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A one- milligram sample of Cu-64 (nuclear mass =63.92 amu) has an activity of 3.82*10^3 Ci.

1a) How many atoms are in the sample?

b) What is the decay rate in atoms/s?

c) What is the rate constant in min-1?

d) What is the half-life in minutes?

2) What percentage of Cu-64 will decay in 4.00hr?

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#### Solution Preview

See the attached files for the solution.

(1)

The nuclear mass of is where

Thus, a single atom mass is:

Thus, in a sample we have:

So in this sample we have atoms of

(2)

A unit of one Ci is given by:

So the decay ...

#### Solution Summary

This a tutorial on how to calculate the rates of decay.

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