Browsing by All Authors "Ayaz, Birsen"

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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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    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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    The effects of hydrogen concentration in reducing atmosphere on microstructure of U02 fuel pellets
    (Turkish Atomic Energy Authority, 2000-10) Ayaz, Birsen; Bilge, Ali Nezihi; Bölüm Yok
    In both conventional high temperature and low temperature sintering techniques, hydrogen is used as sintering and reducing atmosphere to prepare uranium dioxide fuel pellets. It is well known that hydrogen is a dangerous gas to work with. In this work it was aimed to investigate the effects of low-level hydrogen concentration used in reducing atmosphere on micro structure of U0 2 fuel pellets produced by low temperature sintering. Different ratios of H2/Ar (0.1%H2+99.9%Ar, 0.5%H2+99.5%Ar, l%H2+99%Ar and 0%H2 (pure argon)) atmospheres were used as reducing atmosphere for 1, 2, 3 and 6 hours. It was determined that using very low-level hydrogen (1%) in reducing atmosphere prevents the formation of other oxides.