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  • 1. Swiderski, L.
    et al.
    Moszynski, M.
    Czarnacki, W.
    Grodzicka-Kobylka, M.
    Mianowska, Z.
    Sworobowicz, T.
    Szczesniak, T.
    Syntfeld-Kazuch, A.
    Klamra, Wlodzimierz
    KTH.
    Williams, R. T.
    Gridin, S.
    Lu, X.
    Mayhugh, M. R.
    Gektin, A.
    Vasyukov, S.
    Piemonte, C.
    Acerbi, F.
    Gola, A.
    Temperature Dependence of CsI:Tl Scintillation Pulse Shapes from -183°C to +90°C Measured with a SiPM Readout2018In: 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2018Conference paper (Refereed)
    Abstract [en]

    A custom designed cryostat was constructed to measure the response of a CsI:Tl scintillator in temperature range from - 183 ^{circ}\mathrm {C} up to +90 ^{circ}\mathrm {C}. The light readout was realized using a SiPM developed by FBK in near ultraviolet high density (NUV-HD) technology. The crystal and the SiPM were installed on separated copper frames. The crystal was cooled down by liquid nitrogen, while the SiPM was kept at temperature close to room temperature. A separation of 1 mm was kept between the crystal and the photodetector to ensure thermal isolation. The temperature of the crystal could be varied by heaters on the scintillator frame and was continuously monitored using a coil shaped resistance thermometer. The CsI:Tl scintillation decay profiles were recorded in the entire temperature range provided by the cryostat.

  • 2.
    Swiderski, L.
    et al.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Moszynski, M.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Czarnacki, W.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Mianowska, Z.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Sibczynski, P.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Sworobowicz, T.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Szczesmak, T.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Syntfeld-Kazuch, A.
    Natl Ctr Nucl Res NCBJ, PL-05400 Otwock, Poland..
    Klamra, Wlodzimierz
    KTH. Royal Inst Technol, S-10691 Stockholm, Sweden..
    Williams, R. T.
    Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA..
    Gridin, S.
    Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA..
    Lu, X.
    Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA..
    Mayhugh, M. R.
    Faceted Dev LLC, 3641 Rawnsdale Road, Shaker Hts, OH 44122 USA..
    Gektin, A.
    Inst Scintillat Mat, 60 Nauki Ave, UA-61001 Kharkov, Ukraine..
    Vasyukov, S.
    Inst Scintillat Mat, 60 Nauki Ave, UA-61001 Kharkov, Ukraine..
    Piemonte, C.
    FBK, Via Sommarive 18, I-38123 Trento, Italy..
    Ferri, A.
    FBK, Via Sommarive 18, I-38123 Trento, Italy..
    Gola, A.
    FBK, Via Sommarive 18, I-38123 Trento, Italy..
    CsI:T1 Scintillation Pulse Shapes Measured with a SiPM Photodetector in a Liquid Nitrogen Cryostat2016In: 2016 IEEE NUCLEAR SCIENCE SYMPOSIUM, MEDICAL IMAGING CONFERENCE AND ROOM-TEMPERATURE SEMICONDUCTOR DETECTOR WORKSHOP (NSS/MIC/RTSD), IEEE , 2016Conference paper (Refereed)
    Abstract [en]

    A custom designed cryostat was constructed to measure the response of a CsI:T1 scintillator at temperatures close to the boiling point of liquid nitrogen (LN2). The scintillation light was collected by an HUV-HD SiPM from FBK with 6x6 mm(2) area and 25x25 mu m(2) cell pitch. The crystal size was 5x6x7 mm(3). All surfaces except the one facing the SiPM were covered with Teflon tape to enhance light collection by the photodetector. The performance of the experimental setup was verified at room temperature using analog electronics for signal processing. The crystal was mounted on a copper frame placed inside the LN2 cryostat. Since our goal was to measure the scintillation decay profiles, and the SiPM response at low temperatures becomes substantially slower than that observed at room temperature, the SiPM was mounted on a separate copper frame connected with the outer housing to keep it close to room temperature. The separation between the crystal surface and the SiPM was about 1.5 mm at room temperature, and it became smaller once the setup was cooled down to LN2 temperature, but even so the crystal and the photodetector were still separated. This approach allowed us to analyze scintillation pulse shapes of CsI:T1 at LN2 temperatures. An energy spectrum of 662 keV gamma-rays from a Cs-137 source was also recorded. The light yield of the CsI:T1 sample at LN2 temperature stands at about 6 % divided by 8 % of the value observed at room temperature.

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