# Definition of the radiation field
# by means of the General Particle Source
# http://reat.space.qinetiq.com/gps/
/gps/particle gamma
/gps/energy 356.0 keV
/gps/pos/type Volume
/gps/pos/shape Cylinder
/gps/pos/radius 0.30 mm
/gps/pos/halfz 1.75 mm
/gps/pos/centre 0. 0. 0. mm 
/gps/ang/type iso