# (a) Interpretation: The total counting rate for sample is 450cpm (sample plus background) and the counting period for this rate is 15.0min. The counting rate for background is 7 cpm for time period 2.0 min. The value of corrected counting rate is to be determined. Concept introduction: The following formula will be used for the corrected counting rate- R c = R x − R b …….. (1) Where, R c = correcting counting rate R x = counting rate for sample R b = counting rate for background

### Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

### Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

#### Solutions

Chapter 32, Problem 32.7QAP
Interpretation Introduction

## (a)Interpretation:The total counting rate for sample is 450cpm (sample plus background) and the counting period for this rate is 15.0min. The counting rate for background is 7 cpm for time period 2.0 min. The value of corrected counting rate is to be determined.Concept introduction:The following formula will be used for the corrected counting rate-Rc=Rx−Rb …….. (1)Where,Rc = correcting counting rateRx = counting rate for sampleRb = counting rate for background

Interpretation Introduction

### (b)Interpretation:The total counting rate for sample is 450cpm (sample plus background) and the counting period for this rate is 15.0min. The counting rate for the background is 7 cpm for time period 2.0 min. The value of standard deviation σR for the corrected counting rate is to be determined.Concept introduction:The formula used for the calculation of standard deviation for the corrected counting rate is-σRc=Rxtx+RbtbWhere,Rx = counting rate for sampleRb = counting rate for backgroundtx = time required for counting rate for sampletb = time required for counting rate for backgroundσRc = standard deviation for the corrected counting rate

Interpretation Introduction

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