12-3. Describe a method with a radioactive nuclide to determine the
volume of a large container.
12-4. The following count rates were recorded 24 hours after administration
of 0.4 MBq of 131I to the patient:
For the patient’s thyroid 1831 cpm
For the patient’s thyroid shielded by a lead block 246 cpm
For a standard source in a thyroid phantom 3942 cpm
For a standard shielded by a lead block 214 cpm
What is the percent uptake?