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This book provided a design and simulation method for a passivescattering nozzle in proton beam radiotherapy. The doublescattering system including the range modulation wheel in a proton treatment nozzle was designed by using the NEU code. The Monte Carlo particletransport code MCNPX was used in predicting dose distributions in this book. In the passivescattering treatment technique, a rotating range modulation wheel is used to generate a spread out Bragg peak depthdose distribution. This dynamic geometry cannot be modeled in the simulation of MCNPX. This book provided an application of the ?replacing dynamic by static? method to solve this problem. A script ?mcnp_pstudy,? written in Perl programming language, was used to set up a series of MCNPX input files, each of which contains the parameters of a specified step of the wheel, and invoke MCNPX to simulate each problem successively. The other Perl script ?merge_mctal? was used to merge all the separate simulation results into one file containing the simulation results that are equivalent to a ?dynamic? simulation.
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