研究目的
To develop an ultrahigh resolution radiation-imaging detector using a 0.1 mm x 0.1 mm pixelated GAGG scintillator combined with a 1 mm x 1 mm channel size Si-PM array for imaging alpha particles, beta particles, low-energy gamma photons, and X-ray.
研究成果
The developed ultrahigh-resolution pixelated GAGG radiation imaging detector is promising for the imaging of alpha particles, beta particles, low-energy gamma photons and X-ray. The spatial resolution was good for alpha particles, beta particles, low-energy gamma photons and X-ray. Also, pulse-shape discrimination was possible for alpha particles and gamma photons with excellent separation.
研究不足
The spatial resolution for alpha particles was determined by the pixel pitch of the GAGG plate (0.15 mm). The spatial resolution for beta particles, low-energy gamma photons, and X-ray was limited by the light production and the slit width of the tungsten mask used for the measurements.
1：Experimental Design and Method Selection:
The imaging detector was made of a pixelated GAGG plate and a Si-PM array. The pixelated GAGG plate was optically coupled to a glass plate used for the supporting material during dicing process and the glass plate also acted as a light guide to distribute the scintillation light among the several channels of the Si-PM array, helping to reduce the distortion of the image when it was calculated by the Anger principle.
2：Sample Selection and Data Sources:
The GAGG pixelated plate had the pixel size of 0.1 mm x 0.1 mm x 1 mm with 0.05 mm slits between the pixels thus the pitch was 0.15 mm. The number of pixels was 53 x 53 and the total size of the GAGG pixel plate was 8 mm x 8 mm.
3：1 mm x 1 mm x 1 mm with 05 mm slits between the pixels thus the pitch was 15 mm. The number of pixels was 53 x 53 and the total size of the GAGG pixel plate was 8 mm x 8 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The GAGG plate was optically coupled to 1 mm x 1 mm channel size, 8 x 8 Si-PM array (Hamamatsu S13615-1025N-08). Silicone rubber (Shin-etsu Silicone, KE-420) was used for the optical coupling. For the reflector, aluminized Mylar was used.
4：8). Silicone rubber (Shin-etsu Silicone, KE-420) was used for the optical coupling. For the reflector, aluminized Mylar was used.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The analog signals from the developed Si-PM-based radiation imaging detector were fed to weight summing boards with 1-m long, small diameter coaxial cables. The analog signals were individually amplified and were weighed summed by amplifiers. The weighed sum signals were fed to 100-MHz analog to digital (A-D) converters of data acquisition system and integrated for 320 ns; the positions were calculated using the Anger principle by FPGA.
5：Data Analysis Methods:
The calculated results were stored to a personal computer in list mode. The list mode data was sorted to from a 512 (horizontal) x 512 (vertical) x 127 (energy) image for the display and analysis.
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