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Updated: Nov 10, 2025
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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DOSE CONVERSION COEFFICIENTS FROM MONOENERGETIC NEUTRONS COMPUTED WITH THE MCNP6.2 CODE IN THE VIP-MAN PHANTOM
Stephen R McHale1, Erin R Walker1
1United States Naval Academy, Department of Mechanical Engineering, 590 Holloway Road, Annapolis, MD 21402, USA.
Radiation Protection Dosimetry
|April 6, 2021
Summary
This study computed neutron dose conversion coefficients using MCNP6.2 and the VIP-Man phantom, finding results consistent with ICRP 116 guidelines for radiation protection.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Computational Biology
Background:
- Accurate computational dosimetry is crucial for radiation protection, especially for defense organizations dealing with neutron fields.
- Existing models require validation against established phantoms and codes for reliable dose estimation.
Purpose of the Study:
- To compute fluence-to-dose conversion coefficients for neutron fields using the VIP-Man phantom and MCNP6.2 code.
- To compare these computed values with established International Commission on Radiological Protection (ICRP) 116 data.
- To assess the impact of phantom composition and irradiation geometry on dose estimations.
Main Methods:
- Utilized the Monte Carlo N-Particle code version 6.2 (MCNP6.2) for neutron transport simulations.
- Employed the Visible Photographic Man (VIP-Man) numerical model, representing a realistic human anatomy.
- Simulated 45 monoenergetic neutron fields across a broad energy range (10^-9 to 20 MeV) under six distinct irradiation geometries.
Main Results:
- Achieved excellent agreement with the formative VIP-Man study by Bozkurt et al.
- Demonstrated a mean relative difference of 4.7% for absorbed dose conversion coefficients compared to ICRP 116 data across 14 organs and remainder tissues.
- Observed strong similarity in effective dose coefficients to ICRP 116 values, with minor deviations in the posterior-anterior geometry attributed to phantom composition.
Conclusions:
- The VIP-Man phantom coupled with MCNP6.2 provides reliable computational dosimetry for neutron exposures.
- Results align well with ICRP 116 recommendations, supporting their use in radiation protection studies.
- Phantom composition, particularly fatty tissues, can influence dose estimations in specific irradiation geometries.
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