PiN photodiode performance comparison for dosimetry in radiology applications

Area of Science:

• Medical Physics
• Radiation Detection and Measurement
• Semiconductor Devices

Background:

• Photodiodes offer a low-cost, compact, and lightweight solution for radiation detection.
• There is a need for portable electronic dosimeters for real-time radiation dose measurement.
• Photodiodes can function as electronic transducers for dosimeter development.

Purpose of the Study:

• To compare the performance of selected commercial photodiodes for radioprotection applications.
• To evaluate photodiodes based on sensitive area, half angle, and cost criteria.
• To assess the suitability of photodiodes for use in portable electronic dosimeters.

Main Methods:

• Selected four commercial photodiodes (SFH205, SFH206, BPW34, BPX90F) meeting specific criteria (≥5mm² sensitive area, ≥60° half angle, low cost).
• Evaluated photodiode sensitivity (efficiency) to X-rays and gamma rays.
• Assessed device repeatability and linearity concerning air kerma.

Main Results:

• The selected photodiodes demonstrated varying levels of sensitivity and linearity in X-ray and gamma-ray detection.
• Repeatability tests indicated the stability of the photodiodes under radiation exposure.
• Linearity assessments showed consistent responses within the tested air kerma range for some devices.

Conclusions:

• Commercial photodiodes are viable candidates for developing low-power, portable electronic dosimeters.
• The performance characteristics of selected photodiodes support their use in real-time radiation monitoring for radioprotection.
• Further research can optimize photodiode selection and integration for enhanced dosimeter performance.