The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7 × 100 decay events per second (the number of decay events from 1 g radium in 1 s). A 1.7-mL sample of water containing tritium was injected into a 170-lb person. The total activity of radiation injected was 86.5 mCi. After some time to allow the tritium activity to equally distribute throughout the body, a sample of blood plasma containing 2.0 mL water at an activity of 3.6 µCi was removed. From these data, calculate the mass percent of water in this 170-lb person. Neglect the radioactivity change of the sample during experiment time Mass percent =
The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7 × 100 decay events per second (the number of decay events from 1 g radium in 1 s). A 1.7-mL sample of water containing tritium was injected into a 170-lb person. The total activity of radiation injected was 86.5 mCi. After some time to allow the tritium activity to equally distribute throughout the body, a sample of blood plasma containing 2.0 mL water at an activity of 3.6 µCi was removed. From these data, calculate the mass percent of water in this 170-lb person. Neglect the radioactivity change of the sample during experiment time Mass percent =
Chapter19: The Nucleus: A Chemist's View
Section: Chapter Questions
Problem 80CP
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Transcribed Image Text:The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7 x 1040 decay events per second (the number of decay
events from 1 g radium in 1 s). A 1.7-mL sample of water containing tritium was injected into a 170-lb person. The total activity of radiation injected was 86.5 mCi.
After some time to allow the tritium activity to equally distribute throughout the body, a sample of blood plasma containing 2.0 mL water at an activity of 3.6 µCi was
removed. From these data, calculate the mass percent of water in this 170-lb person. Neglect the radioactivity change of the sample during experiment time
Mass percent
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