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Accelerator-based epithermal neutron beam design for neutron capture therapy
J C Yanch1, X L Zhou, R E Shefer
1Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge 02139.
Medical Physics
|May 1, 1992
Summary
High current proton accelerators can generate epithermal neutrons for boron neutron capture therapy (BNCT). Optimized shielding and moderators achieve therapeutic neutron flux for treating deep-seated tumors.
Area of Science:
- Medical Physics
- Nuclear Engineering
- Radiation Oncology
Background:
- Growing interest in epithermal neutron production for Boron Neutron Capture Therapy (BNCT).
- Need for efficient neutron generation using high-current proton accelerators.
Purpose of the Study:
- Investigate the feasibility of generating epithermal neutrons for BNCT using a proton accelerator.
- Optimize neutron beam characteristics for therapeutic applications.
Main Methods:
- Utilized a 2.5 MeV proton beam on a 7Li target to produce neutrons.
- Employed Monte Carlo simulations to design and optimize moderator, reflector, and shielding configurations (D2O, 6Li, lead).
- Evaluated neutron flux, energy spectrum, and therapeutic potential in phantom studies.
Main Results:
- Achieved an epithermal neutron flux of 1.6 x 10(8) n/s at the patient position.
- Demonstrated capability to deliver 3000 RBE-cGy to a 7.5 cm deep tumor.
- Calculated maximum advantage depths of 8.2-9.2 cm with advantage ratios of 4.7-6.3 for deep-seated tumors.
Conclusions:
- A high-current proton accelerator coupled with an optimized moderator/shielding system is feasible for BNCT.
- The designed system can effectively produce therapeutic epithermal neutron beams for treating deep tumors.
- Further development and construction of the moderator/reflector assembly are in progress.