An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison of the (a) contrast and (b)CNR changing the rod radius for 57Co nuclide (black squares marked), 99mTc (red circles marked), 123I (blue upper-triangles marked) and 111In radionuclides (cyan lower-triangles marked).