Browsing by Subject "radiation detection"

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    Radon exhalation rate from building materials using cr-39 nuclear track detector
    (2013) Topcu N.; Bicak D.; Cam S.; Erees F.S.
    Humans are exposed to radiological hazards from natural radiation sources that exist mainly in the earth's crust. Radon is a noble gas and is formed by the decay of 226Ra, which is one of the nuclides formed in the disintegration series from 238U. Building materials are considered as one of the major sources of radon in the indoor environment. Radon is one of the indoor sources that cause radiological health risk. To study radon exhalation rate, samples of sand, gravel, stone, cement, granite, marble, ashlar, ceramic tile and bricks were collected from Manisa and Izmir provinces of Turkey. The radon exhalation rates (in terms of mass and surface area) for these materials were also calculated by using solid-state nuclear track detector (CR-39). The mass and surface exhalation rates are calculated by following the radon activity growth as a function of time. These values were also compared with literature values. © The Author(s), 2013.
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    Visible to infrared low temperature photoluminescence of rare earth doped bismuth germanate crystals
    (Elsevier Ltd, 2016) Canimoglu A.; Ayvacikli M.; Karabulut Y.; Karali T.; Can N.
    In this paper, the influence of a series of rare earth (Eu, Tm, Nd) and Cr ion doping on the optical properties of BGO was investigated by means of photoluminescence (PL) from visible to IR region in the 10-300 K temperature range using different types of detectors, namely, photomultiplier tube (PMT), InGaAs (IGA), and Si. Several samples were investigated having dopants concentrations of 0.3 wt%Nd, 0.4 wt%Tm, 0.06 wt% Cr and 3 ppm Eu. The PL spectra of the samples showed different luminescence behaviour which is assigned to the 4f intra shell transition from rare earth ions. The temperature dependence of the PL from rare earth doped BGO crystals is also examined. © 2016 Elsevier Ltd.