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You have a 1 Ci sample of Th 232 which as a measured half-life of 1.45 x 1010 years. From the documentation accompanying the sample, you see it was assayed in 2010 showing it to be 100% pure. You request another assay to determine the amount of Ra-228 present in the sample. Ra 228 has a half-life of 5.75 years. Based on your calculations, what should the activity of Ra 228 be in the thorium sample considering there have been 2 years since the initial assay?

You have a 1 Ci sample of Th 232 which as a measured half-life of 1.45 x 1010 years. From the documentation accompanying the sample, you see it was assayed in 2010 showing it to be 100% pure. You request another assay to determine the amount of Ra-228 present in the sample. Ra 228 has a half-life of 5.75 years. Based on your calculations, what should the activity of Ra 228 be in the thorium sample considering there have been 2 years since the initial assay?

Modern Physics
Modern Physics
3rd Edition
ISBN:9781111794378
Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Chapter13: Nuclear Structure
Section: Chapter Questions
Problem 25P
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You have a 1 Ci sample of Th 232 which as a measured half-life of 1.45 x 1010 years. From the documentation accompanying the sample, you see it was assayed in 2010 showing it to be 100% pure. You request another assay to determine the amount of Ra-228 present in the sample. Ra 228 has a half-life of 5.75 years. Based on your calculations, what should the activity of Ra 228 be in the thorium sample considering there have been 2 years since the initial assay?
Transcribed Image Text:You have a 1 Ci sample of Th 232 which as a measured half-life of 1.45 x 1010 years. From the documentation accompanying the sample, you see it was assayed in 2010 showing it to be 100% pure. You request another assay to determine the amount of Ra-228 present in the sample. Ra 228 has a half-life of 5.75 years. Based on your calculations, what should the activity of Ra 228 be in the thorium sample considering there have been 2 years since the initial assay?
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