# Create the beam
/gate/source/addSource mybeam gps
/gate/source/mybeam/gps/particle gamma			# Photon

# Define type of energy

# Monoenergetic source
/gate/source/mybeam/gps/ene/type        Mono		# Monoenergetic
/gate/source/mybeam/gps/ene/mono        0.1 MeV		# Monoenergetic 0.1 MeV

# Define the geometry of the source
/gate/source/mybeam/gps/pos/type Plane		# The source is a plane. Can also be: Point, Beam, Volume, or Surface
/gate/source/mybeam/gps/pos/shape Rectangle	# Can also be Circle, Annulus, Ellipsoid and Square for a plane. For Surface 
						# and Volume it can be Sphere, Ellipsoid, Cylinder, or Para. A Point has no shape.
/gate/source/mybeam/gps/pos/rot1 0 0 1		# Defines the orientation of the source. Column (or maybe row) 1 of rotation matrix. 
/gate/source/mybeam/gps/pos/rot2 0 1 0		# Defines the orientation of the source. Column (or maybe row) 2 of rotation matrix.
/gate/source/mybeam/gps/pos/halfx 0.5 cm	# Half the x size of the rectangle
/gate/source/mybeam/gps/pos/halfy 0.5 cm	# Half the y size of the rectangle

# Place the source.
/gate/source/mybeam/gps/pos/centre -0.5 0. 0. cm

#The angular distribution of the source
/gate/source/mybeam/gps/direction 1 0 0

# To check that sources are at the right location in the geometry, you can use the following command
/gate/source/mybeam/visualize 1000 red 2