Prompt gamma and neutron detection in BNCT utilizing a CdTe detector

Area of Science:

• Nuclear physics
• Medical physics
• Materials science

Background:

• Boron Neutron Capture Therapy (BNCT) relies on precise boron detection.
• Current methods for monitoring boron distribution in BNCT have limitations.
• Novel sensor technologies are needed for real-time in vivo dosimetry.

Purpose of the Study:

• To evaluate a novel cadmium telluride (CdTe) detector system for simultaneous prompt gamma and neutron detection.
• To assess the feasibility of using this detector for monitoring boron-10 (¹⁰B) distribution during BNCT.
• To investigate the detector's capability to measure 478 keV prompt gamma photons from the ¹⁰B(n,γ)¹¹B reaction.

Main Methods:

• Utilized a CdTe detector system without dedicated neutron filters.
• Conducted experiments at the FiR1 research reactor using (epi)thermal neutron beams and boronated targets.
• Collected and analyzed gamma and neutron spectra in four distinct experimental setups at low reactor power (2.5 kW).

Main Results:

• The CdTe detector successfully detected and differentiated signals from both boron-10 and cadmium neutron capture reactions.
• The system demonstrated sensitivity to the 478 keV prompt gamma photons characteristic of ¹⁰B neutron capture.
• Simultaneous detection of prompt gamma and neutron radiation was achieved.

Conclusions:

• The novel CdTe detector technology shows significant promise for real-time monitoring of boron distribution in BNCT.
• Its ability to detect prompt gammas and neutrons makes it suitable for spatial and temporal dosimetry.
• This sensor could enhance the efficacy and safety of BNCT treatments.