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Korzhik, M.V.; Kornoukhov, V.N.; Missevitch, O.V.; Fedorov, A.A.; Annenkov, A.N.; Buzanov, O.A.; Borisevicth, A.E.; Dormenev, V.I.; Kholmetskii, A.L.; Sun Kee Kim; Youngduk Kim; Hongjoo Kim; Bratyakina, A.V.
IEEE transactions on nuclear science, 06/2008, Letnik: 55, Številka: 3Journal Article
Several scintillation CaMoO 4 crystals with size up to 28times28times220 mm 3 were grown by the Czochralski method. Their scintillation properties have been evaluated. Light yield of full size crystals measured with a XP2020 PMT is about 4% relative to a small reference CsI(Tl) crystal. Radio luminescence spectrum under gamma-excitation contains single emission peak with maximum at 520 nm. Optical transmission spectra contain a weak absorption band around 420 nm, which has almost no influence on scintillation light. This allows to produce even larger scintillation elements without deteriorating the light yield. Scintillation kinetics was measured under gamma- and alpha-particle excitation both in fast (2000 ns) and slow (200 mus) time scales. Fast components - 12 ns, (0.1%); 200 ns (0.5%) were detected along with slow - 3.8 mus (3.4%); 20 mus (96%) - components. Difference in fast component contribution under gamma and alpha excitation allows to implement pulse-shape discrimination of alpha-radioactive background coming from impurities in the crystals.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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