The Isotope ²⁰¹Th Is Used in the Diagnosis of Heart

question 48

Multiple Choice

The isotope ²⁰¹Th is used in the diagnosis of heart disease.It has a first-order rate constant, k, of 9.49 * 10^-3 h^-1.What is the half-life for ²⁰¹Th?

• A)73 hr
• B)0.014 hr
• C)9.49 * 10^-3 hr
• D)7.3 hr
• E)1.4 hr

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