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14C, the background counting rate for a single blank of a given sample composition was determined to be 25 cpm for 30 minutes. The gross counting efficiency for 14C in this sample composition is 0.82 counts per decay. The counting interval for actual samples will be 10 minutes. Assume the background counting data are random and normally distributed, and that type I and type II error probabilities ( and ) are equal to 0.05. 21) Given a lower limit of detection of 50 cpm, what is the minimum detectable activity MDA for 14C in this sample composition? A.1 Bq В.10 Вq C.20 Bq D.40 Bq Е. 60 Bq

14C, the background counting rate for a single blank of a given sample composition was determined to be 25 cpm for 30 minutes. The gross counting efficiency for 14C in this sample composition is 0.82 counts per decay. The counting interval for actual samples will be 10 minutes. Assume the background counting data are random and normally distributed, and that type I and type II error probabilities ( and ) are equal to 0.05. 21) Given a lower limit of detection of 50 cpm, what is the minimum detectable activity MDA for 14C in this sample composition? A.1 Bq В.10 Вq C.20 Bq D.40 Bq Е. 60 Bq

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The following information applies to Problems 19 – 21. For a given detection system used to measure 14c, the background counting rate for a single blank of a given sample composition was determined to be 25 cpm for 30 minutes. The gross counting efficiency for 14C in this sample composition is 0.82 counts per decay. The counting interval for actual samples will be 10 minutes. Assume the background counting data are random and normally distributed, and that type I and type II error probabilities ( and ) are equal to 0.05. 21) Given a lower limit of detection of 50 cpm, what is the minimum detectable activity MDA for 14C in this sample composition? A.1 Bq В.10 Вq C.20 Bq D.40 Bq Е. 60 Bq
Transcribed Image Text:The following information applies to Problems 19 – 21. For a given detection system used to measure 14c, the background counting rate for a single blank of a given sample composition was determined to be 25 cpm for 30 minutes. The gross counting efficiency for 14C in this sample composition is 0.82 counts per decay. The counting interval for actual samples will be 10 minutes. Assume the background counting data are random and normally distributed, and that type I and type II error probabilities ( and ) are equal to 0.05. 21) Given a lower limit of detection of 50 cpm, what is the minimum detectable activity MDA for 14C in this sample composition? A.1 Bq В.10 Вq C.20 Bq D.40 Bq Е. 60 Bq
For a given detection system used to measure 14c, the background counting rate for a single blank of a given sample composition was determined to be 25 cpm for 30 minutes. The gross counting efficiency for 14C in this sample composition is 0.82 counts per decay. The counting interval for actual samples will be 10 minutes. Assume the background counting data are random and normally distributed, and that type I and type Il error probabilities ( and ) are equal to 0.05. 20) What is the lower limit of detection for 14C in this sample composition? А.3.9 сpm В.4.5 сpm С.6.3 сpm D.11.3 сpm Е.24.3 сpm
Transcribed Image Text:For a given detection system used to measure 14c, the background counting rate for a single blank of a given sample composition was determined to be 25 cpm for 30 minutes. The gross counting efficiency for 14C in this sample composition is 0.82 counts per decay. The counting interval for actual samples will be 10 minutes. Assume the background counting data are random and normally distributed, and that type I and type Il error probabilities ( and ) are equal to 0.05. 20) What is the lower limit of detection for 14C in this sample composition? А.3.9 сpm В.4.5 сpm С.6.3 сpm D.11.3 сpm Е.24.3 сpm
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