The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7 X 1010 decay events per second. A 1.7-mL sample of w’ater containing tritium was injected into a 150-lb person. The total activity of radiation injected was 86.5 mCi. After some tune 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 150-lb person.
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