The MC model of the Gamma Knife was built with the EGSnrc code system, using BEAMnrc and DOSRZnrc user codes. 
EGSnrc
The MC model of the Gamma Knife was built with the EGSnrc code system, using BEAMnrc and DOSRZnrc user codes. 
BEAMnrc
The MC model of the Gamma Knife was built with the EGSnrc code system, using BEAMnrc and DOSRZnrc user codes. 
DOSRZnrc