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Computational phantoms can be employed to estimate or reconstruct organ and effective doses due to external and internal radiation exposures. In this course, we will build upon principles for those familiar with MCNP basics and apply computational modeling skills for internal and external radiation sources in reference male and female adult phantoms. Demonstrations of computing organ doses and effective doses will be conducted.
The objectives of this course are to: (1) review the history and capabilities of computational phantoms; (2) explore using the reference adult computational phantoms in dose estimation; (3) conduct rudimentary real-life problems and applications; and (4) provide in-person resources and support to navigate specific user needs. Participants should register for the PIMAL (Phantom with Moving Arms and Legs) training course on the U. S. Nuclear Regulatory Commission Radiation Protection Computer Code Analysis and Maintenance Program website (https://www.usnrc-ramp.com). Participants are responsible for obtaining their own license for MCNP® from RSICC at https://rsicc.ornl.gov.

PIMAL Overview

The PIMAL code is a graphical user interface with pre-processor and post-processor capabilities which assists users
in developing MCNP input decks and running the codes. It allows users to easily generate quantitative figures of merit regarding positioning arms and legs in difference geometries. PIMAL software is considered an efficient and accurate tool for performing dosimetry calculations for radiation workers and exposed members of the public.
  • Adult phantom based on the ORNL-University of Florida adult phantom.
  • Differs from the ORNL-UF phantom in that the arms and legs are separated from the torso, and can bend at the joints (shoulder, elbow, hip, and knee).
  • Using primarily to accurately simulate the exposure configuration in cases involving unplanned exposures of workers.
  • Arms and legs are bent by using sliders, one for each joint on each arm and leg.
  • The phantom is designed to run as input to the MCNP radiation transport code.
  • PIMAL provides a set of predefined source configurations and radionuclides.
  • The user may modify the MCNP input files to define any desired source configuration.
PiMAL PiMAL PiMAL Layout of the graphical user interface (GUI) for PIMAL. The right panel is used to set the arms and legs, and the bottom panel is used to run the code.