نتایج جستجو برای: bgo
تعداد نتایج: 257 فیلتر نتایج به سال:
We report on a study of the radiation resistance and fluorescence of bismuth germanate scintillation crystals doped with europium (BGO : Eu). The transmission spectrum, the light output and the fluorescence spectrum of BGO : Eu crystals were measured before and after irradiation . The radiation resistance of BGO : Eu crystals was found to be increased with increase of europium doping. A red flu...
A BGO electromagnetic calorimeter is built for DArk Matter Particle Explorer(DAMPE) mission. The temperature effect of BGO ECAL has been investigated with a thermal vacuum experiment. The light output of BGO crystal depends on temperature significantly. Temperature coefficient of each BGO crystal bar has been calibrated, and a correction method is also presented in this paper.
BGO is expected to be plausible devices for soft gamma-ray detectors, because of a high detection efficiency for soft gamma-rays. Here we report on the good performance of BGO readout with PIN-photodiode or avalanche photodiode as a soft gamma-ray detector. We confirmed that the signal output of BGO becomes comparable to that of GSO when it is readout with photodiodes due to better matching bet...
We report on a study of the correlation between radiation damage of bismuth germanate (BGO) scmtillator crystals and trace impunties in the crystal . The light yield and the absorption spectra of doped BGO crystals were measured, both before and after irradiation . While trace concentrations of Cr, Mn, Fe and Pb m BGO were found to lead to substantial radiation damage, traces of Al, Ca, Cu and ...
In a positron-sensitive probe composed of a plastic scintillator and a bismuth germanate (BGO), scattered annihilation photons in the plastic scintillator become background counts. Although these scattered annihilation photons can be rejected by higher threshold level settings for the scintillation pulse of the plastic scintillator and for that of the BGO, the system sensitivity is reduced. We ...
The identification and geographic distribution of the herpes simplex virus type 1 (HSV-1) BglII restriction fragment length polymorphism (RFLP) variants named BgK(L) and BgO(L) in clinical isolates from orolabial and cutaneous sites were described in our previous reports, in which the dispersion and replacement of HSV-1 variants were proposed. The base substitution sites deduced from the BgK(L)...
Due to detector developments in the last decade, the time-of-flight (TOF) method is now commonly used to improve the quality of positron emission tomography (PET) images. Clinical TOF-PET systems based on L(Y)SO:Ce crystals and silicon photomultipliers (SiPMs) with coincidence resolving times (CRT) between 325 ps and 400 ps FWHM have recently been developed. Before the introduction of L(Y)SO:Ce...
We report in this paper an investigation on radiation damage in 20 cm long BGO crystals produced at SIC as well as 20 cm long PWO-II crystals produced at BTCP for the proposed Panda experiment at GSI. The optical and scintillation properties of BGO and PWOII crystals, such as transmittance, light output and light response uniformity, were measured before and after γ-ray irradiations at differen...
The high efficiency of the BGO detectors makes them very attractive candidates to replace NaI(T1) detectors, which are widely used in studies of body composition. In this work, the response functions of the BGO and NaI(T1) detectors were determined at 0.662,4.4, and 10.0 MeV using three different Monte Carlo codes: EGS4,l MCNP,2 and PHOTON.3 These codes differ in their input files and transport...
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