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Item A review of the TAEA proficiency test on natural and anthropogenic radionuclides activities in black tea(Elsevier B.V., 2018-04) Yeltepe, Emin; Şahin, Namık Kemal; Aslan, Nazife; Hult, Mikael; Özçayan, Gülten; Wershofen, Herbert; Yücel, Ülkü; TAEK-SANAEMA proficiency test amongst 15 Turkish laboratories with participation of 5 non-Turkish laboratories was organized to determine the 137Cs, 40K and 90Sr massic activities in black tea powder samples. The bulk material, consisting of tea produced in 2014, was mixed with contaminated tea that was withdrawn from the market after the Chernobyl accident. Nineteen laboratories reported 41 results. The evaluation of the results was based on the accuracy and precision criteria adopted by the IAEA Proficiency Testing Group and resulted in 49% acceptable results, 19% acceptable with warning and 32% were found to be not acceptable.Item Investigation of gamma irradiation and storage period effects on the nutritional and sensory quality of chickpeas, kidney beans and green lentils(Elsevier, 2017) Aylangan, Ayça; Özyardımcı, Berna; İç, Erhan; TAEK-SANAEMThe objectives of this study were to determine the effects of gamma irradiation and storage period on the content of the total carotenoids, the oligosaccharides raffinose and stachyose, and the vitamins thiamine (B1) and riboflavin (B2) in pulses. Chickpea, kidney bean and green lentil samples were subjected to gamma irradiation doses of 0.25, 0.50 and 1.0 kGy followed by storage at room temperature for 12 months. The total carotenoids content was measured by spectrophotometer. Raffinose and stachyose were determined by high-performance liquid chromatography (HPLC) with refraction index detection and thiamine and riboflavin concentrations by HPLC with fluorescence detection. The impact of the irradiation dose can be seen in the result of the total carotene tests for lentils. The three different irradiation doses applied did not have significant effects on the levels of riboflavin and thiamine. The effect of the storage period was found to be significant on the raffinose and stachyose content but there were no significant changes following the applied irradiation doses. In the sensory evaluation the testers were not be able to differentiate between the 0.25, 0.50 and 1 kGy applied irradiation doses and the unirradiated samples. The results of these studies suggest that irradiation with 1.0 kGy gamma rays cause tolerable losses in the nutrients studied in chickpeas, kidney beans and green lentils.Item Phytosanitary irradiation against leafminers (Diptera: Agromyzidae) and radiotolerance of shelled peas(Florida Entomological Society, 2016) Özyarımcı, Berna; Aylangan, Ayça; İç, Erhan; Aydın, Talat; TAEK-SANAEMThe objectives of this research were to develop a phytosanitary irradiation treatment against 3 species of agromyzid leafminers (Diptera: Agromyzidae), and to study the effects of gamma radiation on the physical, chemical, and sensorial properties of shelled peas, Pisum sativum L. (Fabales: Fabaceae). Late pupae (pharate adults) of the 3 species were treated with Co-60 gamma radiation at 0, 80, 100, 120, 150, and 180 Gy. The measurement of efficacy used was the prevention of mine formation in leaves by Fa generation offspring of the leaf miners. Liriomyza sativa Blanchard, L. trifolii (Burgess) and L. huidobrensis (Blanchard) were found to have similar responses to the irradiation doses that prevented formation of leaf mines by Fa offspring; thus no leaf mines were formed by these 3 species in the 150 Gy and 180 Gy treatments. Confirmatory testing successfully undertaken on all 3 species using a grand total of > 30,000 pharate adults corroborated that irradiation with 150 Gy completely prevented the formation of leaf mines. The radiotolerance of shelled peas was studied to ensure that the irradiation treatment does not significantly affect the composition, palatability and flavor of the produce. Pea samples were irradiated at 0.25, 0.5 and 1 kGy and tested for vitamin C, total carotenoids, protein secondary structure, color, and sensory properties. These properties of the peas were significantly but not greatly affected by irradiation with any of the doses tested.Item The study of dosimetric properties of sulfanilic acid in low radiation dose range using the ESR technique(Taylor&Francis, 2024-01-26) Tepe Çam, SemraThe development of new dosimeters with good dosimetric proper-ties is important for quality control in radiation applications. In thisstudy, the potential of sulfanilic acid (C6H7NO3S) powder form, as adosimeter in low-dose ionizing radiation (<30 Gy), was analyzed byan Electron Spin Resonance spectrometer (Bruker EMX-131 X-band).Gamma irradiations were performed at room temperature (290 K)using a60Co gamma cell supplying a dose rate of 32 Gy/h and Xphoton irradiations at 6 and 18 MV energies were performed usinga variant DHX model clinical linear accelerator (Linac) at a dose rateof 3 Gy/min. While unirradiated (control) sulfanilic acid exhibited noESR signal, the irradiated sample showed a single-line ESR spectrumspread over a magnetic field range of 100 G, as shown in Figure2.Variations of the peak heights with the sample mass irradiated at2 Gy gamma dose were studied in the range of 130–330 mg. The ESRsignal intensity observed at g-factor=2.0053 of this compound isdependent on sample mass, so∼250 mg was chosen at each step ofthe study. The paramagnetic center formed in the gamma-irradiatedsulfanilic acid was followed over 50 days. The dose-response curveswere given in the dose range from 0.05 to 10 Gy for the sampleexposed to gamma radiation and for the sample exposed in therange of 0.05 Gy–30 Gy at 6 and 18 MV X-ray energies. The fittingvalues of the function that best describes dose-response curves arecalculated. In the g value region, where the ESR signal was observedin the irradiated sample, the lowest dose value at which the sig-nal could be read was 50 mGy, significantly different from the noise.With all these investigations, sulfanilic acid can be used to esti-mate gamma radiation dose within boundary conditions in medicalapplications.