A study on “position-energy” response correction method based on monolithic crystal coupled SiPM array

• Autorzy: Li Haoxuan , Wang Lei , Lu Wei , Feng Penglei , Zou Kefeng , Peng Jing , Wang Zexi

Identyfikatory

DOI

10.2478/nuka-2024-0024

• Języki publikacji: EN

Abstrakty

EN

The intrinsic characteristics of the monolithic crystal detector are spatially inconsistent, which leads to the position dependence of the detector on the energy response of the γ-ray as well as the peak shift of the response spectrum of the detector, that is, the “position-energy” shift. The “position-energy” shift will cause the energy resolution of the detector to deteriorate and affect the energy linearity of the detector. Thus, a crucial challenge in enhancing the position consistency of detector energy response, improving energy resolution, and ensuring accurate isotope identifi cation is the reduction or elimination of this “position-energy” offset. The “position-energy” response correction method is proposed in this paper to improve the position consistency of detector energy response. Firstly, Monte Carlo simulation is used to model monolithic LaBr3(Ce) crystal detectors of different sizes. Secondly, the effective detection region of the detector model is evenly divided into 25 blocks, then the spectral peak position of each incident region is extracted, and the spectral peak correction function matrix of 25 incident regions and the center position is established. Finally, 25 incident regional peaks are modifi ed according to the modifi ed function matrix, so that the spectral peaks in each region are consistent with the peaks in the center, and the modifi ed spectral responses of the detector are obtained. The simulation results show that this method can effectively solve the “position-energy” migration problem of monolithic crystal detectors of different sizes and improve the peak consistency of each detector region. The energy resolution of the 662 keV characteristic peak of the Cs-137 point source can be improved from 4.5% to 3.9%, and the linear deviation of energy can be reduced from 2.1% to 1.2%.

Słowa kluczowe

EN

correction of energy resolution; correction of peak position uniformity; monolithic crystal; Monte Carlo simulation

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2024
• Tom: Vol. 69, No. 3
• Strony: 169--176
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Li Haoxuan

• Chengdu University of Technology Chengdu, Sichuan 610059, China

autor

Wang Lei

• Chengdu University of Technology Chengdu, Sichuan 610059, China

• https://orcid.org/0000-0003-0265-9450

autor

Lu Wei

• Chengdu University of Technology Chengdu, Sichuan 610059, China

autor

Feng Penglei

• Chengdu University of Technology Chengdu, Sichuan 610059, China

autor

Zou Kefeng

• Chengdu University of Technology Chengdu, Sichuan 610059, China

autor

Peng Jing

• Chengdu University of Technology Chengdu, Sichuan 610059, China

autor

Wang Zexi

• Chengdu University of Technology Chengdu, Sichuan 610059, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).