gammas.mac

# Example macro file - proton beam  
# 
# Initialize kernel
/run/initialize
#
# Specify the beam particle
/gun/particle gamma

# Set the beam particle energy
/gun/energy 5 MeV

# Print to screen progress of run every 100 events
/run/printProgress 100

# One thousand protons will be generated
/run/beamOn 1001