PRINCIPLES OF INSTRUMENTAL ANALYSIS
PRINCIPLES OF INSTRUMENTAL ANALYSIS
7th Edition
ISBN: 9789353506193
Author: Skoog
Publisher: CENGAGE L
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Chapter 32, Problem 32.4QAP
Interpretation Introduction

Interpretation:

The sample of PbSO4 which consist 1-microcurie of Pb-200 and the half-life of this sample is 21.5h. The storage period is to be determined for the activity which is required for the activity which is less than 0.001 microcurie.

Concept introduction:

According to first order of kinetics:

ln(NN0)=λt

Here, N and No are final and initial concentrations, λ is decay constant and t is time.

t1/2(halftime)=ln2λ

Or,

t1/2=0.693λ

Here, t1/2 is half-life time.

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