Change the chapter
Question
The activities of ${}^{131}\textrm{I}$ and ${}^{123}\textrm{I}$ used in thyroid scans are given in Table 32.1 to be $50\textrm{ }\mu\textrm{Ci}$ and $70\textrm{ }\mu\textrm{Ci}$ , respectively. Find and compare the masses of 131 I and 123 I in such scans, given their respective half-lives are 8.04 d and 13.2 h. The masses are so small that the radioiodine is usually mixed with stable iodine as a carrier to ensure normal chemistry and distribution in the body.
$m_{131} = 4.0\times 10^{-10}\textrm{ g}$
$m_{123} = 3.6\times 10^{-11}\textrm{ g}$
Solution Video