Two miniaturised TEPCS in a single detector for BNCT microdosimetry

Area of Science:

• Radiation Detection and Measurement
• Medical Physics
• Nuclear Engineering

Background:

• Tissue-equivalent proportional counters (TEPCs) are ideal for mixed radiation fields, such as those in boron neutron capture therapy (BNCT).
• Accurate dosimetry and microdosimetry are critical for effective radiation therapy and safety in high-intensity radiation fields.

Purpose of the Study:

• To develop and characterize a novel microdosimetry detector for intense radiation fields.
• To assess the performance of a new twin mini TEPC system for dosimetry applications.

Main Methods:

• Construction of a compact detector with two twin cylindrical mini TEPCs within a 2.7 mm titanium sleeve.
• Operation in gas flow mode with precise pressure control (<1% uncertainty).
• Calibration in secondary standard photon fields and measurement of effective sensitive volume.

Main Results:

• The mean effective sensitive volume was measured at 0.86 mm.
• The twin TEPC system accurately processes signals up to 30 kHz counting rates.
• The detector is capable of dosimetric measurements in photon fields up to tens of Gy/h.

Conclusions:

• The newly developed twin mini TEPC is suitable for microdosimetry in intense radiation fields.
• This detector offers precise measurements essential for applications like BNCT.
• The system demonstrates robust performance in challenging radiation environments.