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Wyszukujesz frazę "29.40.Mc" wg kryterium: Temat


Tytuł:
Thermoluminescence and Scintillation Time Profiles of BaF$\text{}_{2}$:Ce
Autorzy:
Głodo, J.
Szupryczyński, P.
Wojtowicz, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/1994962.pdf
Data publikacji:
1999-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Kn
78.60.Ya
78.55.Hx
29.40.Mc
Opis:
In this communication we present results of measurements of low temperature thermoluminescence, isothermal decays, steady state radioluminescence yield, and scintillation time profiles at various temperatures on two scintillator materials, BaF$\text{}_{2}$:Ce and undoped BaF$\text{}_{2}$. We find that all these results can be consistently interpreted in the frame of a model that includes several relatively shallow charge traps. We have identified and characterized one particular shallow trap that causes the decay of the dominant scintillation component of BaF$\text{}_{2}$:Ce to be slower than radiative, as well as a set of others that are responsible for even slower components in the scintillation time profile of this material.
Źródło:
Acta Physica Polonica A; 1999, 95, 2; 259-268
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
Tytuł:
The Effect of Meteorological Parameters on Radon Concentration in Soil Gas
Autorzy:
Kulali, F.
Akkurt, I.
Özgür, N.
Powiązania:
https://bibliotekanauki.pl/articles/1031284.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
47.70.Mc
92.90.+x
Opis:
The production of ²²²Rn depends on the activity concentrations of ²²⁶Ra in the earth's crust, in soil, rock and water. Radon concentration levels are strongly affected by atmospheric influences such as rainfall, real humidity, temperature and barometric pressure, rather than by chemical processes, as it is an inert gas. In particular the exhalation of radon is positively correlated with moisture content, temperature and negatively with pressure, so that these factors must be considered in the determination of exhalation rates in environmental measurements. In this study, radon concentrations in soil gas were continuously monitored for nine months in ten minutes periods, using AlphaGUARD system and the fluctuations of radon concentration were compared with the regional meteorologic data, using time graphs.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 999-1001
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Aspects of Solid State Radioluminescence
Autorzy:
Wojtowicz, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/1994522.pdf
Data publikacji:
1999-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Ya
78.30.Hv
78.60.Kn
29.40.Mc
Opis:
In this paper we review results of radioluminescence studies on two scintillator materials, LuAlO$\text{}_{3}$ and YAlO$\text{}_{3}$, activated with Ce. The experiments include measurements of ther moluminescence, isothermal phosphorescence decays, scintillation light yield as function of temperature, and scintillation time profiles under gamma excitation. Experimental results are interpreted in the frame of a simple kinetic model that includes a number of electron traps. We have identified and characterized a number of deep and shallow traps and demonstrated that traps in LuAlO$\text{}_{3}$:Ce are deeper than corresponding traps in YAlO$\text{}_{3}$:Ce. Unlike deep traps which are responsible for some scintillation light loss but otherwise do not have any impact on generation of scintillation light, shallow traps are shown to actively interfere with the process of radiative recombination via Ce ions. We demonstrate that shallow traps are responsible for some as yet unexplained observations including a higher room temperature light yield of YAlO$\text{}_{3}$:Ce and its longer scintillation decay time, as well as a longer scintillation rise time in LuAlO$\text{}_{3}$:Ce.
Źródło:
Acta Physica Polonica A; 1999, 95, 1; 165-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of LYSO Crystal for the TAC-PF Electromagnetic Calorimeter
Autorzy:
Kocak, F.
Tapan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1033537.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
02.70.Uu
Opis:
In addition to PWO and CsI(Tl) crystals, cerium doped LYSO crystal is considered for the electromagnetic calorimeter part of the Turkish Accelerator Center Particle Factory (TAC-PF) detector, because of its high light yield, fast decay time and good radiation hardness. In this work, LYSO crystals arranged in 3× 3 and 5× 5 matrices have been simulated against photons in the energy range between 50 MeV and 2 GeV, using Geant4 simulation code. Energy resolutions have been estimated considering the contribution of photoelectron statistics coming from the avalanche and PIN photodiodes.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 527-529
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scintillator Purification in the Borexino Detector
Autorzy:
Ianni, A.
Powiązania:
https://bibliotekanauki.pl/articles/1490863.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
Opis:
Borexino, a real-time device for low energy neutrino spectroscopy, has completed the construction phase at the middle of 2006 in the Underground Laboratories at Gran Sasso, Italy. The detector has been filled with 1300 tons of highly purified scintillator and 2600 tons of ultrapure water as external shield and, since May 16th, 2007, is under data taking. The experimental goal, the direct measurement of flux of $\text{}^7Be$ solar neutrinos of all flavour via neutrino-electron scattering in an ultrapure scintillator liquid, has been achieved and further measurements (PP, PeP, CNO neutrinos, geoneutrinos, supernova) are object of future results. The paper describes the purification methods adopted in Borexino, to achieve unique and unprecedented results on the scintillator purity. Requirements and purification methods will be reported.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 101-103
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiopurity of $ZnWO_4$ Crystal Scintillators
Autorzy:
Belli, P.
Bernabei, R.
Cappella, F.
Cerulli, R.
Danevich, F.
Dubovik, A.
d'Angelo, S.
Galashov, E.
Grinyov, B.
Incicchitti, A.
Kobychev, V.
Nagornaya, L.
Nisi, S.
Nozzoli, F.
Poda, D.
Podviyanuk, R.
Prosperi, D.
Shlegel, V.
Tretyak, V.
Vasiliev, Ya.
Vostretsov, Yu.
Powiązania:
https://bibliotekanauki.pl/articles/1550381.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
23.40.-s
Opis:
Recently $ZnWO_4$ was proposed as perspective material for low-counting experiments to search for rare processes. Such experiments demand high radiopurity of $ZnWO_4$ crystal scintillators. With this aim radioactive contamination of large volume (0.1-0.7 kg) $ZnWO_4$ crystal scintillators were measured in the underground Laboratori Nazionali del Gran Sasso of the INFN at the depth of ≈ 3600 m water equivalent.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 139-142
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radioactivity Measurement on Dental Resin Composites
Autorzy:
Akkurt, İ.
Ermiş, R.
Baş, P.
Günoğlu, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402383.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.30.Kv
29.40.Mc
98.70.Vc
Opis:
Radioactivity is mainly due to natural ones from earth and also from outside of the atmosphere so-called cosmic radiation. Although radiation sources and their dose effect on humans are known, there is still some conflict on their health effect especially on dental restoration. The limited data for radioactive dental materials and their potential risks for patient makes those materials interesting to be investigated. For this purposes, uranium, thorium and potassium activity have been measured in some dental restorative materials, such as resin composites containing silica and zirconia particles as filler loading, using gamma spectrometer system with NaI(Tl) detector.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-34-B-36
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prompt-Gamma Monitoring of Proton- and Carbon-Therapy. Combined Development of Time-of-Flight Collimated- and Compton-Cameras
Autorzy:
Dauvergne, D.
Freud, N.
Krimmer, J.
Létang, J.
Testa, E.
Powiązania:
https://bibliotekanauki.pl/articles/1402603.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
07.85.Fv
87.53.Bn
87.56.Fc
87.56.-v
Opis:
Prompt-gamma imaging during ion therapy has proven its ability to control the ion range in real time. The achievable precision is of the order of the millimeter for a single spot in proton pencil beam scanning. Collimated gamma cameras have been developed, that are close to clinical application. The Compton cameras are also under development in various laboratories. Time of flight enables the reduction of the background due to other prompt radiations.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1445-1448
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary studies of J-PET detector spatial resolution
Autorzy:
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Alfs, D.
Białas, P.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Mohammed, M.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Shivani, -
Silarski, M.
Skurzok, M.
Sharma, N.
Sharma, S.
Shopa, R.
Strzelecki, A.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1057928.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
87.57.uk
87.10.Rt
34.50.-s
Opis:
The J-PET detector, based on long plastic scintillator strips, was recently constructed at the Jagiellonian University. It consists of 192 modules axially arranged into three layers, read out from both sides by digital constant-threshold front-end electronics. This work presents preliminary results of measurements of the spatial resolution of the J-PET tomograph performed with ²²Na source placed at selected position inside the detector chamber.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1645-1648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package
Autorzy:
Kowalski, P.
Moskal, P.
Wiślicki, W.
Raczyński, L.
Bednarski, T.
Białas, P.
Bułka, J.
Czerwiński, E.
Gajos, A.
Gruntowski, A.
Kamińska, D.
Kapłon, Ł.
Kochanowski, A.
Korcyl, G.
Kowal, J.
Kozik, T.
Krzemień, W.
Kubicz, E.
Niedźwiecki, Sz.
Pałka, M.
Rudy, Z.
Salabura, P.
Sharma, N.
Silarski, M.
Słomski, A.
Smyrski, J.
Strzelecki, A.
Wieczorek, A.
Wochlik, I.
Zieliński, M.
Zoń, N.
Powiązania:
https://bibliotekanauki.pl/articles/1402625.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
87.57.uk
87.10.Rt
34.50.-s
Opis:
Novel positron emission tomography system, based on plastic scintillators, is developed by the J-PET collaboration. In order to optimize geometrical configuration of built device, advanced computer simulations are performed. Detailed study is presented of background given by accidental coincidences and multiple scattering of gamma quanta.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1505-1512
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties and Lattice Parameters of $Lu_{2x}Gd_{2(1-x)}SiO_{5}:Ce$ Scintillation Crystals
Autorzy:
Maksimchuk, V.
Baumer, V.
Bondar, V.
Galich, Yu.
Kurtsev, D.
Sidletskiy, O.
Powiązania:
https://bibliotekanauki.pl/articles/1550446.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
29.40.Mc
Opis:
Structural and mechanical characteristics of complex oxide compounds $Lu_{2x}Gd_{2-2x}SiO_{5}:Ce$ (LGSO) crystals were studied at different cation ratio in the host. For this purpose, a series of LGSO crystals with Lu concentration 5-70 at.% has been grown by the Czochralski method. Anisotropy of mechanical properties for these materials has been studied. The obtained results can be useful at choice of optimal growth direction for crystals and at mechanical processing of scintillation elements.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 146-149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Background CdWO₄ Scintillation Detector
Autorzy:
Kasperovych, D.
Danevich, F.
Kobychev, V.
Kropivyansky, B.
Tymoshenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030928.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
29.30.Kv
Opis:
Low background scintillation setup has been developed that exhibits 3 orders of magnitude lower counting rate of a large volume (2.1 kg) CdWO₄ detector in the energy region 0.5-2.6 MeV, and one order of magnitude above 3 MeV. The background reduction was achieved by application of radiopure passive shield, active plastic-scintillation muon veto placed above the setup and pulse-shape discrimination. Construction of additional plastic scintillation counters is in progress to reduce the residual cosmic muons background. The setup can be applied to develop radiopure scintillators, measure radioactive contamination of materials, carry out small scale low counting experiments.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 923-927
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Radiation Shielding Properties of Soda-Lime-Silica Glasses Doped with Different Food Materials
Autorzy:
Çetin, B.
Yalçin, Ş.
Aktas, B.
Albaşkara, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031927.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.-n
29.40.Mc
Opis:
In this study, radiation shielding properties of soda-lime-silica glasses doped with different food materials such as the egg shell and the peanut shell powders were investigated. Egg shell and peanut shell powders were obtained by grinding of waste shells in an agate mortar. The SLS glass samples with varying egg shell/peanut shell content were produced by melting. The measurements have been performed using the gamma spectrometer, containing a 3" × 3" NaI (Tl) detector, and connected to a full featured 16K channel Multi Channel Analyzer provided by ORTEC/MAESTRO-32 software.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 988-990
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet
Autorzy:
Wiśniewski, K.
Koepke, Cz.
Wojtowicz, A. J.
Drozdowski, W.
Grinberg, M.
Kaczmarek, S. M.
Kisielewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2007834.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.55.-m
78.60.Kn
73.50.Gr
29.40.Mc
78.20.-e
78.20.Wc
78.40.-q
Opis:
In this paper we report preliminary results of optical studies on Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 403-412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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