Figure 17.
An illustration of the different path lengths through the thick target. The travel distance through the target to the bottom detector is greatly exaggerated.
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.