   Chapter 32, Problem 20PE

Chapter
Section
Textbook Problem

What is the mass of 60Co in a cancer therapy transillumination unit containing 5.00 kCi of 60Co?

To determine

The mass of 60Co in a cancer therapy trans illumination unit containing 5.00 kCi of 60Co.

Explanation

Given info:

The activity of 60Co

R=5.00 kCi

Half life of 60Co

t1/2=5.26 y

Formula used:

The number of atoms N of 60Co is given by,

R=0.693Nt1/2

Calculation:

Express the activity in Becquerel (Bq)

R=5.00 kCi× 103 Ci1 kCi×3.7× 10 10Bq1 Ci=1.85×1014Bq

Express the half life in seconds.

t1/2=5.26 y×365 d1 y×24 h1 d×3600 s1 h=1.65879×108s

Rewrite the formula for N and calculate the number of atoms of 60Co that can have an activity of 5

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