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  • Jegal, Jin  (2)
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  • 1
    Online Resource
    Online Resource
    Cryogenic Temperatures Characterization of an MAPbBr 3 Perovskite and a Silicon Photomultiplier for Radiation Detector Applications
    Wiley ; 2023
    In:  physica status solidi (b) Vol. 260, No. 5 ( 2023-05)
    Details
    In: physica status solidi (b), Wiley, Vol. 260, No. 5 ( 2023-05)
    Abstract: Methylammonium lead bromide (MAPbBr 3 ) perovskites are strong candidates for application as radiation detectors with both semiconducting and scintillating properties. The crystalline phase transition of MAPbBr 3 at cryogenic temperatures changes its electrical and optical properties. Herein, the optical and electrical properties of MAPbBr 3 are studied as a function of the decreasing temperature for cryogenic radiation detector applications. The optical properties are investigated by measuring the photoluminescence spectra excited using 310 and 410 nm light‐emitting device, while the electrical properties are assessed by measuring the dark current and photocurrent. Furthermore, the premature breakdown voltage and gain of a silicon photomultiplier coupled with MAPbBr 3 as a photosensor are measured in relation to the temperature.
    Type of Medium: Online Resource
    ISSN: 0370-1972 , 1521-3951
    URL: Issue
    URL: Article
    DOI: 10.1002/pssb.v260.5
    DOI: 10.1002/pssb.202200313
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 208851-4
    detail.hit.zdb_id: 1481096-7
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  • 2
    Online Resource
    Online Resource
    Convolutional neural network-based reconstruction for positronium annihilation localization
    Springer Science and Business Media LLC ; 2022
    In:  Scientific Reports Vol. 12, No. 1 ( 2022-05-20)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 12, No. 1 ( 2022-05-20)
    Abstract: A novel hermetic detector composed of 200 bismuth germanium oxide crystal scintillators and 393 channel silicon photomultipliers has been developed for positronium (Ps) annihilation studies. This compact 4π detector is capable of simultaneously detecting γ-ray decay in all directions, enabling not only the study of visible and invisible exotic decay processes but also tumor localization in positron emission tomography for small animals. In this study, we investigate the use of a convolutional neural network (CNN) for the localization of Ps annihilation synonymous with tumor localization. Two-γ decay systems of the Ps annihilation from 22 Na and 18 F radioactive sources are simulated using a GEANT4 simulation. The simulated datasets are preprocessed by applying energy cutoffs. The spatial error in the XY plane from the CNN is compared to that from the classical weighted k-means algorithm centroiding, and the feasibility of CNN-based Ps annihilation reconstruction with tumor localization is discussed.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-022-11972-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2615211-3
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