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    Wyświetlanie 1-5 z 5
    Tytuł:
    Non-Contact Luminescence Lifetime Microthermometry using Scintillation Sensors
    Autorzy:
    Mykhaylyk, V.
    Kraus, H.
    Wagner, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030994.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Ps
    Opis:
    The paper describes an original technique for non-contact in situ monitoring of the temperature developed for experiments in a vacuum environment at the tender X-ray beamline I23 of the Diamond Light Source. The sample temperature is established by determining the luminescence decay constant of a Bi₄Ge₃O₁₂ (BGO) scintillation sensor. BGO is ideally suited for a temperature range of 30 K to 130 K, in which its decay constant shows a strong temperature dependence. The principle of the method, system design and application examples are discussed and the performance and potential of the technique is assessed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1108-1111
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research and Development of $ZnBO_{4}$ (B = W, Mo) Crystal Scintillators for Dark Matter and Double Beta Decay Searching
    Autorzy:
    Dubovik, A.
    Vostretsov, Yu.Ya.
    Grinyov, B.
    Danevich, F.
    Kraus, H.
    Nagornaya, L.
    Mikhailik, V.
    Tupitsyna, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1549650.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    78.70.Ps
    Opis:
    Oxide crystal scintillators play a considerable role in fundamental and applied researches. However, working out of new generation of high-sensitivity equipment and new methods of research puts higher requirements. The $ZnBO_{4}$ (B = W, Mo) crystals were grown from charge in platinum crucibles with high frequency heating, using the Czochralski method. The raw powder with optimum composition was prepared by solid phase high temperature synthesis using ZnO and $BO_{3}$ (B = W, Mo) with 4-5N purity. Single crystals with sizes up to ∅ 50 × 100 mm were grown and scintillation elements of various sizes and shapes (cylinders, rectangular and hexahedron prisms) were produced. High spectrometric characteristics were obtained for $ZnWO_{4}:R$ = 8-10% under excitation by $\text{}^{137}Cs (E_{γ}$=662 keV), low radiation background (less than 0.2 mBq/kg) and low afterglow (0.002%, 20 ms after excitation). The obtained results demonstrate good prospects for $ZnWO_{4}$ and ZnMoO_{4} crystal scintillators for application in low-count rate experiments, searching for double beta decay processes, interaction with dark matter particles, and also studies of rare decay processes. The material has also a good potential for application in modern tomography, scintillation bolometers and for other major researches using scintillators.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 15-19
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
    Autorzy:
    Xiao, X.
    Xu, J.
    Lu, B.
    Cai, W.
    Zhang, Y.
    Shen, H.
    Yang, B.
    Xiang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399369.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    61.05.C-
    78.20.Ci
    78.70.Ps
    Opis:
    The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 854-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czochralski Growth and Properties of Scintillating Crystals
    Autorzy:
    Yoshikawa, A.
    Chani, V.
    Nikl, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399452.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    78.70.Ps
    29.40.Mc
    78.55.Hx
    Opis:
    The Czochralski method is one of the very few melt growth techniques that are industry friendly when considering the combination of quality, dimensions, and cost of the produced crystals suitable for their commercialization in scintillation detectors. This method is one of the oldest and most developed crystal growth processes regarding an adequate understanding the physical phenomena observed during solidification process and its practical expansion especially in the industrial scale production. It allows controllable formation of single-crystalline cylindrical ingots of various inorganic scintillation materials. The review summarizes recent progress on the Czochralski growth of a number of scintillation materials. The oxide crystals are mainly considered including the Ce and Pr-doped $RE_3Al_5O_{12}$, RE = Y, Lu, aluminum garnets and newly discovered ultraefficient Ce-doped $Gd_3(Ga,Al)_5O_{12}$ multicomponent garnet, high density $PbWO_4$ and $CdWO_4$ tungstates, Ce-doped $RE_2SiO_5$, RE = Y, Gd, Lu, oxyorthosilicates and $(Y,Lu)AlO_3$ aluminum perovskites and finally the classical $Bi_4Ge_3O_{12}$ scintillator. Additionally, the details of the growth of other practically important non-oxide crystals, namely the Ce and Eu-doped $LiCaAlF_6$ neutron and ultraefficient Ce-doped $LaBr_3$ scintillators, are discussed. The potential of novel micro-pulling down growth method is briefly described in the combinatorial search for new scintillator materials. Selected luminescence and scintillation characteristics including the spectra and decay kinetics, light yield and radiation resistance are also illustrated and overviewed.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 250-264
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Sub-Wavelength Effective Refractive Index Layer on the Transmittance of LYSO Scintillator
    Autorzy:
    Modrzyński, P.
    Olejniczak, A.
    Zięba, A.
    Kunicki, P.
    Tomanik, M.
    Wielebski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032338.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Bs
    42.25.Gy
    42.79.Dj
    02.70.Bf
    78.70.Ps
    29.40.Mc
    Opis:
    From various types of scintillating materials lutetium-yttrium oxyorthosilicate (LYSO) has the highest luminosity and the greatest potential of application in high-energy radiation detectors. Due to the small critical angle of total internal reflection the enhancement of the extraction of light outside a scintillator is a challenge. We study numerically the influence of the effective refractive index layer on the transmittance of LYSO crystal. It is possible to realize such layer by sub-wavelength patterning of crystal surface using for example focused ion beam. The enhancement of transmittance of LYSO crystal up to 100% as well as the possibility to tune the positions of transmittance maxima have been shown.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1565-1569
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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