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Figure 1 :a. Cobalt-60 source confi guration modeled in the current MC Study. 1b. Cobalt source housing and primary collimator modeled in step I of MC simulation. Interaction histories at the bottom of the primary collimator were stored in a phase space fi le

Figure 1 :a. Cobalt-60 source confi guration modeled in the current MC Study. 1b. Cobalt source housing and primary collimator modeled in step I of MC simulation. Interaction histories at the bottom of the primary collimator were stored in a phase space fi le