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Design optimization of a 1-D array of stemless plastic scintillation detectors.

Samaneh Aynehband1, Ian G Hill1, Alasdair Syme1,2,3

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Optimizing the photodiode component of stemless plastic scintillation detectors (SPSDs) significantly increased signal output. This enhancement improves radiation detection capabilities for dosimetry applications.

Keywords:
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Area of Science:

  • Medical Physics
  • Materials Science
  • Detector Physics

Background:

  • Stemless plastic scintillation detectors (SPSDs) combine plastic scintillators and organic photodiodes.
  • SPSDs are suitable for dosimetry in small radiation fields.
  • Previous work has not systematically optimized the photodiode component of SPSDs.

Purpose of the Study:

  • To optimize the design of a 1D array of SPSDs to maximize measured signal.
  • To improve spatial resolution without degrading signal-to-noise ratio.
  • To retain benefits of plastic scintillation detectors while avoiding challenges of optical fiber systems.

Main Methods:

  • Fabrication involved etching ITO-covered PET, spin-coating with PSS and P3HT:PCBM, and adding aluminum electrodes.
  • Optimization variables included spin coater speed (film thickness), P3HT:PCBM ratio, solution concentration, and scintillator coating.
  • Substrate cleaning and material deposition were performed using specific chemical and physical processes.

Main Results:

  • Increasing film thickness from ~80 nm to ~138 nm increased signal by ~7.7 times.
  • A P3HT:PCBM ratio of 4:1 yielded ~3.5 times higher signal compared to 1:1.
  • Optimized devices showed a 24-fold increase in sensitivity (~0.02 nC/cGy to ~0.5 nC/cGy).

Conclusions:

  • The photodiode component of SPSDs was systematically optimized to enhance signal output.
  • The most efficient device utilized a 2:1 P3HT:PCBM ratio and 4% solution concentration.
  • Coating the scintillator with white paint improved signal output by approximately 2.2 times.