Development of a detector with two photo-strip sensors and a crystal scintillator between sensors
- Resource Type
- Conference
- Authors
- Bae, J. B.; Hyun, H. J.; Kah, D. H.; Kim, H. J.; Kim, H. O.; Park, H.
- Source
- 2011 IEEE Nuclear Science Symposium Conference Record Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE. :1167-1170 Oct, 2011
- Subject
- Nuclear Engineering
Bioengineering
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Signal Processing and Analysis
Crystals
Particle measurements
Atmospheric measurements
Detectors
Photonics
Light emitting diodes
Fabrication
- Language
- ISSN
- 1082-3654
We fabricate single-sided strip sensors that are sensitive to light. The strip sensors are AC-coupled, which has coupling capacitors and bias resistors. The sensors are fabricated on a high resistivity and double-sided polished n-type silicon wafer. The sensor is designed as the single-side strip sensor but its backside (n-side) is modified to be sensitive to incoming light. This photo-strip sensor is designed to measure positions of incoming gamma ray and alpha particle. The photo-strip detector consists of two photo-strip sensors and one crystal scintillator. The sensors sandwiching opposite faces of a scintillator are oriented orthogonally to each other to provide two-dimensional position information. When particles enter a crystal, the scintillator light of a crystal is emitted and penetrates into the photo-strip sensors. The lights are then converted to electron-hole pairs in the sensors. The detector configuration provides not only two-dimensional position information, but also the depth of interaction (DOI). The DOI is given by comparing signal-to-noise ratio between the first and second photo-strip sensors. The fabricated sensors are electrically tested by varying bias voltages. The pulse heights of the detector are measured by using Am-241 alpha, Na-22 and Cs-137 gamma ray sources. The position information is obtained with one photo-strip sensor and the LYSO crystal scintillator by using Am-241 alpha source. An experiment to obtain two-dimensional position information with two photo-strip sensors and a scintillator crystal is on going.