Answer
Yes, the source is usable.
Work Step by Step
The time since the source was created is 2.5 years.
Calculate the current activity.
$$(5000Ci)2^{-2.5yr/5.271yr}=3600Ci$$
This is barely above the usability threshold of 3500 Ci.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 43 - Nuclear Physics - Problems - Exercises - Page 1476: 43.20
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