Explanation Write the expression of total activity of radioactive serum in blood sample. q 1 = a 1 v 1 Here, a 1 is activity of radioactive serum per 10 cm 3 volume of blood sample and v 1 is total volume of blood sample. Since cosmic rays cause background activity of 155 min − 1 therefore the value of a 1 is the difference of ( 2600 min − 1 − 155 min − 1 ) which is equal to 2445 min − 1 . Write the expression of total activity of radioactive serum in sample from standard. q 2 = a 2 v 2 Here, a 2 is activity of radioactive serum per 10 cm 3 volume of standard sample and v 2 is total volume of standard sample. Since cosmic rays cause background activity of 155 min − 1 therefore the value of a 2 is the difference of ( 1892 min − 1 − 155 min − 1 ) which is equal to 1737 min − 1

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ISBN: 9780471522782

Author: Morton M. Sternheim

Publisher: WILEY

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Chapter 31, Problem 49E

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Total volume of blood serum of patient.

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Chapter 31, Problem 48E

Chapter 31, Problem 50E

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A rear molar from a mammoth skeleton is dated using a measurement of its 14C content. Carbon from the tooth is chemically extracted and formed into benzene. The benzene sample is placed in a shielded chamber. Decays from the sample come at an average rate of 11.5 counts per minute. A modern benzene sample of the exact same size gives 54.9 counts per minute. What is the age of the skeleton?

A sample counted for 10 minutes resulted in 1,000 counts. The background count was 250 counts over a 10 minute period. Assuming negligible radioactive decay of the sample during counting, the net counting rate in counts per minute and the standard deviation are approximately: a. 750±35 cpm b. 75±10 cpm C. 75+3.5 cpm d. 85±5.5 cpm e. 8±6 cpm

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Total volume of blood serum of patient.

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