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Nirmalasari, YD and Suparmi, Suparmi and Sardjono, Yohanes (2017) Study of the Variation of Material layer Compotition and Thickness Related Neutron Flux and Gamma Radiation. Optimation of simulation design of collimator is corresponding to 30 MeV cyclotron generator. The simulation has used the variation of the thickness materials layers that was applied at treatment room's door. The purpose of the variation and thickness of, 909.