Figure 1.
Photograph (a) of a film piece positioned on top of a slab of PWDT to simulate reduced backscatter conditions, and diagram (b) of setup with a lead sheet beneath the solid water slab.
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.