Characterisation of the TAPIRO BNCT epithermal facility

Area of Science:

• Nuclear physics
• Medical physics
• Radiation oncology

Background:

• Boron Neutron Capture Therapy (BNCT) is an advanced radiation therapy requiring precise neutron beams.
• Fast research reactors can be adapted to produce neutron beams suitable for BNCT.
• Characterization of neutron fields is crucial for ensuring treatment efficacy and safety.

Purpose of the Study:

• To design and construct a collimated epithermal neutron beam for BNCT research at the TAPIRO fast research reactor.
• To experimentally and computationally characterize the radiation field within the irradiation chamber.
• To verify the beam's compliance with International Atomic Energy Agency (IAEA) requirements for BNCT.

Main Methods:

• Experimental characterization using activation techniques, thermoluminescent detectors (TLDs), gel dosemeters, and a superheated drop detector neutron spectrometer.
• Monte Carlo simulations using MCNP4B and MCNPX_2.1.5 with the direct statistical approach (DSA) for independent verification.
• Measurement of slow neutron fluxes, fast neutron dose, gamma dose, and fast neutron spectrum.

Main Results:

• Comprehensive experimental data on neutron fluxes and doses were obtained.
• Monte Carlo simulations provided independent verification of experimental findings.
• The radiation field characterization confirmed agreement with IAEA requirements.

Conclusions:

• The designed epithermal neutron beam at the TAPIRO reactor meets the necessary quality standards for BNCT research.
• The combined experimental and computational approach ensures accurate and reliable characterization of the radiation field.
• This validated beam facility supports further development and application of BNCT.