Cilt:01 Sayı:02 (2014)

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https://dspace.ankara.edu.tr/handle/20.500.12575/39772

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    Calculation of neutron flux for the intense neutron source (µCF-INS) in optimum conditions
    CHASHTI, M.; KALANTARI, S. Z.
    In this study, the neutron spectrum of a high intense neutron source (µCF-INS) based on muon catalyzed fusion was investigated in new conditions. In order to determine optimum conditions for the production of high neutron flux with 14.1 MeV energy our study was grouped into three steps: the first includes the moderation µ- before entering into fuel mixture, the second is the calculation of neutron intensity produced by µCF cycle in D/T target and the third is simulation of output neutron flux from the device. The muon catalyzed fusion cycles were analyzed according to kinetic equations solved by Rung-Kutta method of the fourth order. Finally, transport of neutrons in DT mixture and its container was simulated by the MCNP4C code to calculate the output neutron intensity. The results show that the intensity of neutron produced by µCF-INS generator is in order of 1017 sn. When this result is compared with those from other neutron generators, µCF-INS generator operating at optimum conditions has a high neutron production yield.
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    Determination of natural radioactivity levels in Kars- city center, Turkey
    CENGİZ, G. B.; REŞİTOĞLU, S.
    The objective of this study is to determine the distribution of natural radionuclides in surface soils in the Karscity center, Turkey. The activity concentrations of 238U, 232 Th, 40 K and 137Cs in 38 soil samples collected from the study area were measured through NaI(Tl) gamma spectrometry. The average activities of the samples were determined to be 47.8, 31.2 and 536 Bqkg-1 for the natural radionuclides 226Ra (238U), 232Th, 40K, respectively, and 18 Bqkg-1 for the fission product 137Cs. When the present results are compared with the data available for other cities in Turkey, the soil radioactivity concentrations obtained in this study indicate that the region has a background radiation level within natural limits but the measured average activity of 40K depending on soil texture is slightly higher than the other parts of country.