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A 3-Dimensional Dosimeter System

A Benson*, U Akgun , Coe College, Iowa City, IA


(Sunday, 7/14/2019) 3:00 PM - 3:30 PM

Room: Exhibit Hall | Forum 4

Purpose: To develop a water equivalent, radiation hard scintillator, and use it on a 3D dosimeter system. This compact dosimeter system using SiPMs, can be used for electron and gamma applications.

Methods: A novel, radiation-hard plastic scintillator was developed with a peroxide-cured polysiloxane base, doped with the primary scintillator p-terphenyl and the secondary scintillator bis-MSB. The synthesis conditions and the solubility of the base with the scintillators are optimized. The light yield of the scintillator was compared to known scintillators with a Sr-90 source. The temperature dependency of the light production was also tested between 22 C and 75 C. The radiation hardness was tested up to 4x10^5 Gy. This novel scintillating material, named Scint-X, has a density very close to that of water, 0.97 g/cm^3. Its cost- effectiveness, and large volume production capabilities make it superior to scintillating crystals for dosimeter applications. A 3D dosimeter using Scint-X, with a unique geometry, was designed, and its performance was simulated via Geant4. A 10cm x 10cm x 5cm prototype was build and tested with electron beam.

Results: Scint-X, a water equivalent, radiation-hard, plastic scintillator was successfully developed. This report summarizes the synthesis procedure, optical properties, temperature dependency and radiation hardness of the material, as well as the efforts to use this material to build a standalone three-dimensional dosimeter. The Geant4 simulation studies, with 6-20 MeV electron and X-ray beams show promising results. The real beam tests of a small prototype, with unique geometry, also confirmed that reconstructing the 3D geometry of a radiation dose within Scint-X is possible.

Conclusion: This study summarizes the research on developing a novel material and potentially using it in a 3D dosimeter. The tests on determining the properties of the material, the Geant4 simulation studies, as well as the beam tests of a prototype are reported.


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