Chapter 19.5, Problem 107ES

In medicine, iodine 131 has been used to treat hyperthyroidism as well as thyroid cancer. Recently, the use of this iodine 131 has been replaced by the use of iodine 132 because is has a shone, half-life. (Source: radioactivity.com)

The formula ${\log }_{10}(1-k)=\frac{-0.3}{H}$ models therelationship between the half-life H of a radioactive material and its rate of decay k. Find the rateof decay of the iodine isotope I-131 if its half-lifeis 8 days. Round to four decimal places.