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.
Transmission function (a) and PSF (b) for a typical beryllium CRL at 17 keV with parameters 
= 20, 
= 50, 
= 50 µm, 
= 2 mm, 
= 0.15 mm. The solid black line corresponds to the cumulative response of the CRL, while the dotted red and blue lines correspond to the contributions from the material absorption and physical aperture, respectively.
