X-ray escape peaks in gamma-ray spectrum acquired by perovskite detector

Journal Article · Mon Jun 23 00:00:00 EDT 2025 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2025.170794· OSTI ID:2574242

Oksuz, Ibrahim ^[1]; Cao, Lei R. ^[2]

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1. The Ohio State University, Columbus, OH (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)
2. The Ohio State University, Columbus, OH (United States)

The X-ray escape peaks are clearly visible in the high-resolution gamma spectra acquired by CsPbBr₃, credit to the rapidly improving energy resolution of perovskite gamma detectors. But it also raises concerns. If this peak remains as significant as it is, perovskite gamma detectors would have very limited use in complex gamma spectrometry applications. This paper discusses the origin of the escape peaks in CsPbBr₃ detectors, benchmarked against Ge and CZT detectors. The Pb escape peak consists of four escape peaks that are merged together, while the Cs and Br escape peaks are hidden inside the photopeak of ¹³⁷Cs (662 keV). These combined effects either create a noticeable gamma peak observed to the left of the 662 keV photopeak when acquired using a high-resolution CsPbBr₃ detector or raise the left slope of the photopeak. We also explore potential methods to mitigate these peaks, such as applying anti-coincidence method. The height of the escape peaks diminishes as the detector volume increases but will not go away entirely. The relationship between the observed Pb escape peak and the detector's dimensions is demonstrated through Monte Carlo simulation.

• Research Organization: The Ohio State University, Columbus, OH (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0003921
• OSTI ID: 2574242
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 1080; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

CsPbBr3
Escape peak
FAPbBr3
Gamma spectrometer
Gamma spectroscopy
Gamma-ray
Lead
Perovskite