Computational phantoms with articulated arms and legs have been developed in the PIMAL (Phantom wIth Moving Arms and Legs) software, which is part of the NRC RAMP program. Using this special tool, one can adjust the posture of a computational phantom, generate a corresponding MCNP input file, and perform accurate radiation transport simulations for estimating organ doses and/or effective doses. In this project, we performed two practical applications related to radiation safety of medical staff, aiming to explore the relationship between organ doses and the resulting effective dose of a medical staff under two common irradiation scenarios: (1) handling nuclear medicine by hands and (2) performing interventional fluoroscopy.