   Chapter 31, Problem 45PE

Chapter
Section
Textbook Problem

Data from the appendices and the periodic table may be needed for these problems.A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85 × 10 7 Bq . (a) What is the present activity in mCi? (b) How long ago did it actually have a 4.00—mCi activity?

To determine

(a)

What is the present activity in mCi if a C60o source is labeled 4.00 mCi, but its present activity is found to be 1.85×107Bq ?

Explanation

Given info:

Formula used:

Calculation:

Present activity,

R=1.85×107Bq=1.85×1073.70×1016=5

To determine

(b)

How long ago did it actually have a 4.00-mCi activity?

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