2014/09/25 by T. Szczesniak, T. Szczęśniak, M. Grodzicka +5
Physics and Astronomy · #Nuclear Physics and Applications #Particle Detector Development and Performance #Radiation Detection and Scintillator Technologies
paper · doi:10.1109/tns.2014.2357772
openalex publication_date 2014/09/25 · crossref created 2014/09/25 · crossref issued 2014/10/01 · crossref published 2014/10/01 · crossref published-print 2014/10/01 · crossref deposited 2022/01/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29 · crossref indexed 2026/07/29
A micro photomultiplier (microPMT or μPMT) works like a classic photomultiplier but the whole device is made directly in a silicon wafer sandwiched between two glass layers. A microPMT has dimensions of only 13x10x2 mm and its photocathode has a size of 3x1 mm. The aim of the work is to check usefulness of a microPMT in gamma spectrometry with scintillators and fast timing. In the first part of the study analysis of the energy resolution obtained with 3x3x1 mm LSO, BGO and CsI(Tl) scintillators is made. The recorded values for 662 keV are equal to 22.9% and 13.5% for CsI and LSO, respectively. The light pulse shapes of a single photoelectron and scintillation signal of LSO are also shown. The important part of the study is measurement of the number of photoelectrons and estimation of the excess noise factor. Only 2200 phe/MeV were obtained for LSO coupled with the tested microPMT. The calculated excess noise factor is equal to 1.4. In the second part, measurements of the time jitter and timing resolution with LSO crystal for 511 keV annihilation quanta are reported. The timing characteristics of the tested device is poor. Its time jitter equals to 1.5 ns, whereas timing resolution for22Na is 620 ps. All the results are compared with data obtained with classic PMTs.