Browsing by All Authors "Tuğrul, A. Beril"

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    A statistical study of filtres used as shielding for PC monitors
    (Turkish Atomic Energy Authority, 2000-10) Tuğrul, A. Beril; Altınsoy, Nesrin; Ayaz, Birsen; 200243; Bölüm Yok
    In this paper it was aimed to obtain a radiological study about the attenuation of radiation of PC fdters which are produced by different companies. For this purpose different radiation sources were used for UV (ultraviolet) IR (infrared), visible light and X-ray radiation. For every type of radiation measurements, the most proper detector was selected. The radiation measurements were made with and without fdters and the measurements were taken for different distances. Measurements have bee observed for white & black and coloured monitors radiation levels for X-ray emission. All results were compared according to related regulations. Furthermore all data evaluated statistically in the point of view of public safety.
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    Flow rate determination for open channel flows by using radiotracer balance method
    (Turkish Atomic Energy Authority, 2000-10) Tuğrul, A. Beril; Altınsoy, Nesrin; 200243; Bölüm Yok
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    Investigation on Golden Horn (Haliç) quaternary sequence by determination of alpha and beta radioactivity levels
    (Turkish Atomic Energy Authority, 2000-10) Tuğrul, A. Beril; Baytaş, Filiz; Altınsoy, Nesrin; Ayaz, Birsen; Doğan, Nilgün; Şahin, Sudiye; Bölüm Yok
    Radioactivity level is a factor that affects of environmental variations. In this study, quaternary sequence was evaluated by the discussion of radioactivity anomalies. For this purpose, an example drill samples of quaternary sequence were found from Golden Horn (Haliç) quaternary sequence. Samples were prepared with grinding and sieving carefully. Then, the measurements were taken in two different counting system for beta and alpha measurements. Alpha and beta radioactivity was evaluated by using related calibration curves. Results of the study, it is evident that especially alpha count rates can be used for the clay evaluation because of the clay which has more magmatic elements that include uranium and thorium in it. So it is shown that the alpha counting technique can be used for general evaluation of the quaternary sequence easily.
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    Red gold analysis by using gamma absorption technique
    (Turkish Atomic Energy Authority, 2000-10) Kurtoğlu, Arzu; Tuğrul, A. Beril; Bölüm Yok
    Gold is a valuable metal and also preferable materials for antique artefacts and some advanced technology products. It can be offered for the analysis of the gold as namely; neutron activation analysis, X-ray florescence technique, Auger spectroscopy, atomic absorption and wet chemistry. Some limitations exist in practice for these techniques, especially in the points of financial and applicability concepts. An advanced a practical technique is “gamma absorption technique” for the gold alloys. This technique is based on discontinuities in the absorption coefficient for gamma rays at corresponding to the electronic binding energies of the absorber. If irradiation is occurred at gamma absorption energy for gold, absorption rates of the red gold changes via the gold amounts in the alloy. Red gold is a basic and generally preferable alloy that has copper and silver additional of the gold in it. The gold amount defines as carat of the gold. Experimental studies were observed for four different carats of red gold; these are 8, 14, 18 and 22 carats. K-edge energy level of the gold is on 80 keV energy. So, Ba-133 radioisotope is preferred as the gamma source because of it has gamma energy peak in that energy. Experiments observed in the same geometry for all samples. Nal(Tl) detector and multichannel analyser were used for measurements. As a result of the experiments, the calibration curves could be drawn for red gold. For examine this curve, unknown samples are measured in experimental set and it can be determined the carat of it with the acceptability. So the red gold analysis can be observed non-destructively, easily and quickly by using the gamma absorption technique.