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Browsing Rapor by Publisher "T.A.E.C., Çekmece Nuclear Research And Training Center"
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Item A method for calculating plutonium source LMFBR accidents(T.A.E.C., Çekmece Nuclear Research And Training Center, 1975) Kırbıyık, M.; TAEK-ÇNAEMItem A modelled theory of pulsed-neutron experiments in fast subcritical assemblies(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Adalıoğlu, Ulvi; Duderstadt, J. J.; TAEK-ÇNAEMThe time behavior of a neutron pulse in a fast subcritical assembly is modeled by approximating the spatial dependence by a single diffusion mode and using a simple model of inelastic scattering. This model allows an explicit calculation of the time response of a detector in such a system. Of particular interest is a study of the detector response in those situations in which the flux does not decay in an exponential fashion.Item A simple method of automatic optical transmission plotting(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Ferendeci, A. M.; TAEK-ÇNAEMA simple electronic analog divider is described for plotting the transmittance or reflectance characteristics of optical materials as a function of wavelength. It is designed with commercially available integrated circuits and it automatically takes the ratio of any two signals connected to its inputs. The output is recorded as the spectrum is scanned by a monochromator.Item A switchboard between the computer and the teletype printer(T.A.E.C., Çekmece Nuclear Research And Training Center, 1977) Başol, Toygun S.; TAEK-ÇNAEMTandem Akselerator Laboratuarındaki OLDA on-line programı ile iletişim kurmak için mevcuda göre daha hızlı ve daha elverişli olan bir Switchboard'un tasarımı ve imali gerçekleştirildi. Switchboard, bilgisayar ile on-line uzak yazıcı (TTY) arasında yer alacak biçimde düşünülür. TTY kullanıldığında olağan 4 tuşla elde edilen komutlar, OLDA programında çok sık olan komutlardan bazıları için bir seçenek kaynak olan switchboard'da tek bir tuşun basılması ile sağlanır. Bundan başka, Switchboard'u kullanarak TTY nin "dışarıya basması" ile oluşan zaman kaybını beklemeksizin diğer bir komut gönderilir.Item An oil-water cooled linear magnet system(T.A.E.C., Çekmece Nuclear Research And Training Center, 1978) Subaşı, Metin; Tarcan, Gökçe; TAEK-ÇNAEMBurada özel yağ-su soğutmalı yedi ayrı, ortası oyuk silindir biçiminde (pancake) bobinlerden oluşan doğrusal (lineer) bir DC elektro-mıknatıs sistemi tanıtılmaktadır. Manyetik alan yoğunluğu 170 Gauss/A olup eldeki güç kaynağı (40V - 500A) ile erişilen en yüksek alan şiddeti 3 kGauss'tur. Bobinler arası uzaklık 4 cm alındığında 80 cm'lik bir bölgede elde edilen eksenel elan düzgünlüğü 4%' den daha iyidir.Item Comparison of 65 Zn Loss - Rate of mytilus gallaprovincialis determined in the field and laboratory conditions(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Ünlü, M. Y.; TAEK-ÇNAEMWe have carried out experiments on the loss-rate of 65Zn by Mytilus galloprovincialis in the laboratory and in the field. We came to the conclusion that the results were obtained in the field and laboratory can be comparable if the physical and chemical conditions in the field are not changed very frequently.Item Digital determination of TR-1 control rod worths and time behaviour of neutron flux(T.A.E.C., Çekmece Nuclear Research And Training Center, 1976) Ertek, Ç.; TAEK-ÇNAEMIn this work, the control rod reactivity worth of the swimming- pool type reactor (TR-I) in ÇNAEM, Çekmece Nuclear Research and Training Centre has been measured digitally and the mean neutron lifetime has been estimated by a special miniature fission chamber with 60 nanosecond resolving time. The time behaviour of thermal neutrons is also compared with reactor control console results.Item Dosage radiometrique du thorium dans les minerals de Turquie(T.A.E.C., Çekmece Nuclear Research And Training Center, 1975) Uzmen, R.; İpekoğlu, B.; TAEK-ÇNAEMTürkiye Toryum cevherlerinin fiziksel zenginleştirme işlemlerinde toryumun süratli ve rutin analizine ihtiyaç olduğundan, cevher içinde Th2-*2 ile izotopik dengede "bulunan Pb212 nin 0,24 MeV'deki pikinin sayımından yararlanılarak toryum miktar tâyin eğrisi çizilmiştir. Kimyasal yol ile daha önceden cevher içindeki toryum miktarı t âyin edilmiş olduğundan ayrıca standart toryum bileşiği kullanılmamıştır.Item High-field transport properties of aluminum-embedded aluminum oxide films(T.A.E.C., Çekmece Nuclear Research And Training Center, 1973) Birey, Hülya; TAEK-ÇNAEMCurrent-voltage characteristics of aluminum-embedded aluminum oxide thin films with Al or Au electrodes, between 150-1000 Â in thickness, prepared by thermic evaporation of pure aluminum in partial air pressure are studied. I - V characteristics of these films showed metallic conductivity, switching, and memory effects different than those observed in amorphous materials, and metal-oxide-metal diode characteristics as the amount of metallic aluminum within the oxide is decreased in respective samples. The switching and memory effects are found to be independent of oxide thickness and electrode material.Item Investigation of the aqueous glycine solution as a gamma-ray and neutron dosimeter(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Tuğsavul, Ayşen; TAEK-ÇNAEMItem Metallic aluminum particle concentration in aluminum oxide thin films(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Birey, H.; TAEK-ÇNAEMTwo different methods based on (a) the tunneling junction model and (b) the optical model are used to determine the metallic aluminum particle concentration in aluminum oxide thin films prepared by thermal evaporation of pure aluminum under appropriate vacuum conditions. The concentration determined from these two models agree with each other at high concentrations and show considerable deviation at low concentrations.Item On the numerical difference between homogeneous and heterogeneous calculations of uranium 238 capture rate ratios in light water reactors(T.A.E.C., Çekmece Nuclear Research And Training Center, 1975) Ertek, Ç.; Özbir, Yıldıray; TAEK-ÇNAEMItem Production of radioisotope 28Mg by (n, alpha) - (t, p) reaction at nuclear reactor(T.A.E.C., Çekmece Nuclear Research And Training Center, 1975) Gülbaba, T.; Gülbaba, G.; TAEK-ÇNAEMItem Radioprotective and metabolic effects of AET on rat embryonic cells in culture(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Şengün, A.; Bölükbaşı, E.; Üçer, E.; Anıl, D.; TAEK-ÇNAEMThe experimental results confirm the literary- data on the radioprotective activity of AET. This radiation protection has been demonstrated in the. increase of survival of rat embryonic cells exposed to various doses of ionizing radiation in culture. Concerning the mechanisms of action, it seems important that a correlation exists between the radioprotective and metabolic effects of the compound, the latter manifesting itself in depression of DM, RNA, and protein syntheses of pretreated cells. It is suggested that slowing of the metabolic activity and mitotic cycle in cells lead to a state of their enhanced radioresistance or repair capability. This research work envisaged under Contract Number 833/Rl/RB, was financially supported by the International Atomic Energy Agency in Vienna.Item Some observations on the production and quality control of radioisotope 18 F(T.A.E.C., Çekmece Nuclear Research And Training Center, 1976) Gülbaba, Tülin; TAEK-ÇNAEMItem The amino acid composition of microorganisms grown on olive waste(T.A.E.C., Çekmece Nuclear Research And Training Center, 1977) Özyurt, Mustafa; TAEK-ÇNAEMVarious yeasts and filamentous fungi grown on olive waste were analysed to assess their amino acid composition.The quantities of individual amino acids in the microorganisms tested were calculated as percent in total protein.In general, it was found that methionine was the lowest in quantity and glutamic acid was the largest when compared with the others, both in the yeasts and filamentous fungi.Item The complex chemistry of uranylnitrate - P - aminobenzoic acid system(T.A.E.C., Çekmece Nuclear Research And Training Center, 1973) Bal, Y.; Erben, M. Talat; TAEK-ÇNAEMUranil iyonu ve p-aminobenzoik asit arasındaki kompleks oluşumu % 50 alkol-su ortamında spektrofotometrik olarak incelenmiştir. Neticeler, çok yüksek ligand konsantrasyonlarında bile bütün ligantın bağlandığını göstermektedir. Böylece, bir uranil iyonu ile kompleks yapan ligand moleküllerinin ortalama sayısı koordinasyon sayısını pek çok aşarak 170 ve daha da yüksek değerlere erişmektedir.Item The determination of U, Np and Pu in urine by sequential extraction with alamine-336 from hydrochloric acid medium(T.A.E.C., Çekmece Nuclear Research And Training Center, 1974) Veselsky, J. C.; Kırl, Pak Chan; Sezginer, N.; TAEK-ÇNAEMA method has been developed for the extraction of uranium, neptunium and plutonium from human urine using the comparatively cheap technical amine ALAMINE-336. These elements are coprecipitated with a calcium phosphate carrier, which is then subjected to a wet-ashing procedure with HN0(3)/H(2)0(2) HCl/H(2)O(2). The residue is dissolved in 10M hydrochloric acid and U, Np and Pu are extracted with a 10% ALAMINE-336/xylene solution, followed by subsequent back-extraction with 10M HCl/NH(4)I (Pu), 4M HC1/HF (Np) and 0,1M HCİ (U), respectively. The average recoveries are around 95%.Item The effect of 4 - dimethylaminoazobenzene (DAB) on the mitochondria of the cells cultivated in tissue culture II - the effect of 4 - dimethylaminoazobenzene (DAB) on mitochondrial enzymes(T.A.E.C., Çekmece Nuclear Research And Training Center, 1973) Enginün, Mine; Üçer, Ertan; TAEK-ÇNAEMİyi bilinen bir karsinojen olan 4-dimetilaminoazobenzen’in (DAB) embriyonik sıçan hücrelerinin mitokondriumları ve mitokondrial Isositrat (ICDH) ve glutamat (GLDH) dehidrogenazlar üzerindeki tesiri histokimyasal olarak araştırılmıştır. 0.1 mg DAB ihtiva eden vasatta embriyonik sıçan hücreleri 1.5, 3, 5 ve 24 saat inkübe edildiklerinde, yüksek enzim aktivitesi gösteren mitokondriumların sayılarının arttığı müşahade edilmiştir. Vasattan DAB nin çıkarılması halinde bilhassa ICHD aktivitesinin aşağı yukarı normal hücrelerde görülen seviyeye düştüğü görülmüştür, ki bu da hücrelerin ve enzimlerin ortamdan DAB nin kalkmasıyla yeniden eski hallerini alabildiklerini göstermektedir.Item The gamma-ray spectrum from radiative capture of the first resonance neutrons in 149Sm(T.A.E.C., Çekmece Nuclear Research And Training Center, 1975) Cansoy, Ç.; Atasoy, H.; Özbaylı, C.; TAEK-ÇNAEMA 37-cc lithium-drifted germanium defector has been used in conjunction with the ÇNAEM neutron crystal sectrometer to examine the gamma-ray spectrum arising from neutron resonance capture in 149Sm. The effective Gamma-ray energy resolution of 0.6-2.4 keV allowed 17 transitions to be examined in the energy range between 109 and 1806 keV following the capture of 0.0976 eV resonance neutrons in 149Sm. The spectrum is intepreted in terms of the levels In the compound nucleus, 150Sm. An analysis of the reduced intensities of 38 El transitions which consist of 9 secondary, and 29 primary transitions indicates that they have a cumulative Porter-Thomas distribution. A similar, analysis has been applied to 15 M1 transitions which consist of 4 secondary and 11 primary, transitions.