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Neutron-fluence-to-dose conversion coefficients in an anthropomorphic phantom
A A Alghamdi1, A Ma, M Tzortzis
1Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK. a.alghamdi@surrey.ac.uk
Radiation Protection Dosimetry
|December 31, 2005
Summary
This study calculated neutron dose conversion coefficients using the Zubal phantom and MCNPX code. Results show good agreement with other models for left lateral irradiation, aiding radiation protection assessments.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Computational Biology
Background:
- Accurate neutron dosimetry is crucial for radiation protection.
- Existing anthropomorphic phantoms and codes are used to estimate organ doses.
- Tissue weighting factors are essential for effective dose determination.
Purpose of the Study:
- To calculate neutron fluence-to-effective-dose conversion coefficients using the Zubal phantom.
- To evaluate dose conversion coefficients under different irradiation geometries.
- To compare results with established models and investigate modifications to weighting factors.
Main Methods:
- Utilized the MCNPX code and a high-resolution anthropomorphic Zubal phantom.
- Simulated 13 monodirectional monoenergetic neutron beams (10^-9 to 20 MeV).
- Calculated doses for 18 selected organs under anterior-posterior, posterior-anterior, and left lateral irradiation.
Main Results:
- Generated fluence-to-effective-dose conversion coefficients for neutrons <20 MeV.
- Calculated coefficients using a modified wR factor from ICRP Publication 92.
- Observed good agreement between Zubal model and MIRD/VIPMAN models in left lateral geometry, despite some discrepancies.
Conclusions:
- The Zubal phantom provides reliable dose conversion coefficients, particularly for left lateral neutron exposure.
- Discrepancies highlight the importance of phantom choice in dosimetry.
- Findings contribute to improved radiation protection standards and effective dose estimations.