The design of radiation detectors for space applications is a challenging radiation protection and shielding problem. The detectors not only must be designed with appropriate radiation protection and shielding but also must receive a meaningful signal through the shielding. Space radiation detectors typically are designed with analog Monte Carlo calculations and may require days or weeks to model and design photon pulse-height sensors. A new pulse-height tally with variance reduction capability in MCNPX has been used to analyze the signal of a simplified satellite radiation sensor. The new method, along with the appropriate variance reduction strategy, sped up the calculation by a factor of 419.
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