Optimization of the beam shaping assembly in the D-D neutron generators-based BNCT using the response matrix method

Area of Science:

• Nuclear physics
• Medical physics
• Radiation oncology

Background:

• Neutron generators are crucial for various applications, including cancer therapy.
• Accurate characterization of neutron beams is essential for treatment planning.
• Current evaluation methods for neutron beam parameters are computationally intensive.

Purpose of the Study:

• To optimize the Beam Shaping Assembly (BSA) for a D-D neutron generator.
• To develop a computationally efficient method for evaluating neutron beam performance in phantom.
• To validate the accuracy of the proposed method against direct calculations.

Main Methods:

• Utilized MCNP4C Monte Carlo code for BSA design and optimization.
• Defined optimal BSA configuration using in-air figures of merit (FOM) with specific moderator, reflector, and filter materials.
• Introduced a Response Matrix (RM) method based on neutron spectrum and dose component calculations.

Main Results:

• An optimized BSA design was determined using Fluental, Pb, and Li filters.
• The Response Matrix method demonstrated good agreement with direct, time-consuming in-phantom calculations.
• Significant reduction in computational time for neutron beam evaluation was achieved.

Conclusions:

• The optimized BSA design enhances neutron beam characteristics for potential therapeutic applications.
• The Response Matrix method offers a practical and efficient approach for evaluating neutron dosimetry.
• This work contributes to advancing neutron-based medical applications through improved simulation techniques.