   Chapter 31, Problem 49PE

Chapter
Section
Textbook Problem

Data from the appendices and the periodic table may be needed for these problems.Cow's milk produced near nuclear reactors can be tested for as little as 1.00 pCi of 131I per liter, to check for possible reactor leakage. What mass of 131I has this activity?

To determine

What mass of 131I which produce activity 1pCi .

Explanation

Given info:

The half-life of 131I is 8.04days .

Convert days in to seconds.

8.04days=8.04day×86400s1day=694656s

The activity of 131I is 1pCi

Converting the unit of activity form converting curies to becquerels.

1pCi=1×1012Ci×3.7×1010BqCi-1=0.037Bq

Formula used:

To find the mass first we need to find the number of atoms involved to produce this activity.

N(131I)=R×t120

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