Question

The isotope lodine-131 is a radioactive isotope used in industrial and medical applications. It is prepared just before use because it decays rapidly through beta emission. Use the data in the table below to answer the following questions (a) Write the reaction equation. (Note m indicates an excited state of the isotope, which is generally denoted with an asterisks after the symbol, such as X*) (b) What is the rate constant for the decay? Show how you obtained this rate constant. Use the eror in the rate constant to determine the significant figures for the rest of thae answerS. (c) What is the half-life of the isotope? (d) What percentage of the isotope is lost if it takes 1.30 hr to prepare and administer the dose? Time (min) 10 12 16 25 Emission/Capture rate (particle/min) 9774 9772 9768 9767 9765 9759

Answer 1

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-p Ort 12.5 0 6.2 123 냐 。. 영 Hald-lites od have pal e -fra Rate dec 9odine 131 as a xanchom tirme