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Depth Dose Profile and Exposure Time Calculation in an 60 Co Irradiation Processing Facility: MCNP and GEANT4
Farshid Tabbakh1,2,3, Ali Nabipour Chakoli1,2,3, Sufian M Tajudin1,2,3
1Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, 14155-1339, Tehran, Iran.
Health Physics
|August 7, 2025
Summary
This study introduces a novel mathematical method for calculating radiation dose in moving objects within non-uniform fields. It optimizes conveyor speed in cobalt-60 (60Co) facilities for precise dose delivery, enhancing irradiation efficiency.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Nuclear Engineering
Background:
- Accurate radiation dose calculation is critical for moving objects in non-uniform radiation fields.
- Traditional methods for determining conveyor speed in irradiation facilities rely on trial-and-error, leading to inefficiencies.
- Optimizing dose delivery in facilities like those using Cobalt-60 (60Co) sources is essential for effective radiation processing.
Purpose of the Study:
- To develop and present a mathematical method for calculating absorbed radiation dose for moving objects in non-uniform fields.
- To determine the optimal conveyor speed in a 60Co irradiation facility to ensure uniform dose delivery to boxes.
- To optimize the design and performance of radiation processing facilities for faster and more efficient operation.
Main Methods:
- Investigated a 60Co gamma-ray irradiation processing facility with a moving planar source.
- Calculated dose profiles within boxes based on their positions relative to the source.
- Employed Monte Carlo simulation tools, MCNPX (version 2.7) and Geant4 (version 10.5), for reliable dose calculations.
Main Results:
- A mathematical method was proposed to calculate absorbed dose as a function of time and position.
- The conveyor speed was successfully determined to achieve a desired total dose for each box.
- Dose profiles within boxes were calculated, providing insights for facility design optimization.
Conclusions:
- The developed mathematical method enables precise dose calculation for moving objects in non-uniform radiation fields.
- Optimizing conveyor speed is crucial for efficient and effective radiation processing in 60Co facilities.
- The study contributes to the optimization of radiation processing facility design for enhanced performance and reduced footprint.
