Presentation Information
[8p-E204-2]Development of a Compact Merged Dual-Side Readout System for CdTe Gamma-Ray Spectroscopy and Imaging
〇(P)Siyao Chang1, Setsuo Sato1, Yuki Mitsuya1, Hiroyuki Takahashi1,2 (1.Tokyo Univ., 2.Kumamoto Univ.)
Keywords:
CdTe detector,Readout circuit,Gamma-ray imaging
A novel merged dual-side readout architecture for pixelated CdTe detector arrays is proposed. In the detector array, pixel electrodes at identical spatial positions are merged and read out together, while signals from the common electrode of each detector chip are processed independently. The proposed architecture reduces the readout complexity from O(M×N) to O(M+N) while retaining information from both detector electrodes.
A 5×5 CdTe detector array with a 20.4 mm × 20.4 mm area was constructed. A custom charge-sensitive preamplifier circuit and a waveform-sampling data acquisition system were developed for simultaneous acquisition of both side signals. Event pairing was performed using coincidence timing between the two electrode sides, and interaction positions were reconstructed based on electrode mapping. Gamma-ray imaging experiments were carried out using a 137Cs source. The reconstructed hit maps successfully reproduced the source position, demonstrating the feasibility of the proposed concept.
Owing to its simple and scalable structure, the proposed method can be readily adapted to a wide range of semiconductor detector systems and provides a practical solution for future large-area gamma-ray imaging applications.
A 5×5 CdTe detector array with a 20.4 mm × 20.4 mm area was constructed. A custom charge-sensitive preamplifier circuit and a waveform-sampling data acquisition system were developed for simultaneous acquisition of both side signals. Event pairing was performed using coincidence timing between the two electrode sides, and interaction positions were reconstructed based on electrode mapping. Gamma-ray imaging experiments were carried out using a 137Cs source. The reconstructed hit maps successfully reproduced the source position, demonstrating the feasibility of the proposed concept.
Owing to its simple and scalable structure, the proposed method can be readily adapted to a wide range of semiconductor detector systems and provides a practical solution for future large-area gamma-ray imaging applications.