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.
Proportion of photons from the material upstream of the target, with energies greater than the threshold in the measurement, calculated with EGSNRC, option set 1: (a) 10–30 MV results on the beam axis, and (b) 15 MV results showing dependence on angle. Plots are fluence from the pretarget material relative to total fluence. Results of simulations with the target chamber removed have the points marked with crosses.
