A peer-reviewed journal published by K. N. Toosi University of Technology

Document Type : Research Article


1 Nuclear Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Physics Department, Tehran University, Tehran, Iran


Digital spectroscopy with Silicon Photomultiplier (SiPM) array coupled on CsI(Tl) crystal, needs some consideration to achieve desirable energy resolution. an array of SiPMs must be used with large scintillation crystal, therewithal signal from whole SiPMs is not ideal. Also silicon pixels are arranged in arrays at regular intervals. The distances between the pixels and the interference of the cross-talk of adjacent pixels are undesirable factors for energy resolution when the light is received by the crystal and transmitted to the SiPM array. On the other hand, due to the advantages of the SiPM array, there is a need to improve the energy resolution in order to be able to be applied. In this paper, an attempt is made to obtain the desired energy resolution by using the digital spectroscopy method and digital filters and properly shaping the output pulse of the preamplifier by the trapezoidal filter method. In this case, it will be possible to use it in different applications such as spectroscopy by the detector.


  • In this article a 2 × 2 SiPM array coupled with CsI(Tl).
  • Designing preamplifier circuit for each channel of SiPM, and also summed circuit to sum 4-channel of array.
  • PWrite algorithm of trapezoidal digital filter.
  • Using conventional Multichannel analyzer for summed channel and get spectrum.
  • The algorithm for digital spectroscopy method has been compared with the analog method.


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