CALCULATION OF CONVERSION COEFFICIENTS FOR VOXELIZED PHANTOMS FOR CRITICALITY ACCIDENT DOSIMETRY

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Nuclear Safety

Background:

• Criticality accidents necessitate accurate organ dose assessment beyond maximal dose.
• Neutron radiation requires considering individual morphology for precise organ dose calculations.
• Current simulation tools are time-consuming, especially when incorporating detailed morphology.

Purpose of the Study:

• To create a database of conversion coefficients for estimating organ doses from dosemeter measurements.
• To account for victim morphology (body mass index) and orientation in radiation fields.
• To provide a faster method for organ dose evaluation in criticality accident scenarios.

Main Methods:

• Utilized voxelized anthropomorphic phantoms for dose simulations.
• Calculated conversion coefficients based on simulated radiation transport.
• Investigated the impact of varying morphology and radiation field orientation.

Main Results:

• Developed conversion coefficients that incorporate morphology and orientation.
• Demonstrated the significant influence of these parameters on organ dose.
• Established a methodology for rapid organ dose estimation.

Conclusions:

• Conversion coefficients are vital for accurate organ dose assessment in criticality accidents.
• Morphology and orientation are critical factors influencing neutron organ dose.
• The developed coefficients offer a practical tool for emergency response and dosimetry.