Exploring neutron capture therapy with ³³S and ¹⁰B.

Area of Science:

• Nuclear Physics
• Medical Physics
• Radiation Oncology

Background:

• Neutron Capture Therapy (NCT) typically uses the 10B(n,α)7Li reaction.
• The 33S(n,α)30Si reaction was proposed as a cooperative neutron capture agent for NCT.
• Previous 33S(n,α)30Si cross-section data were limited and inconsistent.

Purpose of the Study:

• To re-evaluate the 33S(n,α)30Si reaction for NCT applications.
• To calculate dose rates using updated cross-section data.
• To assess the cooperative potential of 33S and 10B in NCT.

Main Methods:

• Collected new experimental cross-section data for the 33S(n,α)30Si reaction at CERN's n_TOF and Institut Laue-Langevin.
• Calculated kerma factors using the new data.
• Modeled dose rates on ICRU-4 tissue using a simplified phantom and a 13.45 keV neutron beam.

Main Results:

• New experimental data for 33S(n,α)30Si were obtained.
• A significant enhancement in dose rate was observed due to the presence of 33S.
• The 13.45 keV neutron energy corresponds to a key resonance for 33S(n,α)30Si.

Conclusions:

• The 33S(n,α)30Si reaction shows significant potential for enhancing dose rates in NCT.
• The cooperative action of 33S and 10B is a promising area for further investigation.
• This approach is particularly relevant for accelerator-based neutron sources without moderators.