Organ and Effective Dose Assessments using MCNP with Computational PIMAL Phantoms and Realistic Eye Model in...

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Computational Modeling

Background:

• Accurate dosimetry is crucial for occupational radiation protection.
• Computational phantoms serve as vital tools for simulating radiation interactions within the human body.
• Existing models may have limitations in representing dynamic physiological states.

Purpose of the Study:

• To evaluate the utility of the PIMAL (phantom with moving arms and legs) computational phantoms for radiation dose assessment.
• To simulate occupational radiation exposure scenarios in nuclear and medical environments using PIMAL phantoms.
• To validate PIMAL phantom results against established dosimetry data and reference phantoms.

Main Methods:

• Utilized Monte Carlo N-Particle (MCNP) Version 6.2 simulations.
• Employed PIMAL phantoms, mathematically defined human body models with moving limbs.
• Calculated equivalent organ doses and converted them to effective dose (E) using ICRP Publication 103 weighting factors.
• Simulated monoenergetic particle exposures and occupational scenarios in nuclear and medical settings.

Main Results:

• PIMAL phantom simulations showed good agreement with literature data using ICRP adult reference voxel phantoms.
• Effective dose rates were estimated for nuclear workers and compared with personal dose equivalent rates.
• Effective dose rates were calculated for personnel in a CANDU-600 reactor and for medical staff exposed to positron emitters.
• Derived effective doses from PIMAL phantoms were consistent with operational dose quantities.

Conclusions:

• PIMAL phantoms are effective tools for calculating effective doses in occupational radiological settings.
• The PIMAL models support detailed dose assessment and radiation protection planning in both nuclear and medical fields.
• These validated models enhance the accuracy of radiation safety assessments for workers.