Browsing by Access Type "Attribution 3.0 United States"

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    Activity concentrations of 224Ra, 226Ra, 228Ra and 40K radionuclides in refinery products and the additional radiation dose originated from oil residues in Turkey
    (Oxford University Press, 2013-10) Parmaksız, Aydın; Ağuş, Yusuf; Bulgurlu, Figen; Bulur, Emine; Yıldız, Çiğdem; Öncü, Tolga; AAH-5187-2020; 0000-0003-4000-5175; TAEK-SANAEM
    Total of 56 crude oil, refinery product, waste water, sludge and scale samples collected from three refineries were measured by gamma-ray spectrometry. Except for nine samples, all refinery products samples were found below the minimum detectable activity (MDA) values. 224Ra, 226Ra, 228Ra and 40K activity concentrations in crude oil and refinery product samples were measured from MDA values to 11.7±4.5, 14.9±3.5, 11.6±4.5, 248.5±18.5 Bqkg-1 respectively. 224Ra, 226Ra, 228Ra and 40K activity concentrations in scale, sludge and water samples were measured from MDA values to 343.7±11.8, 809.2±29.0, 302.5±21.6, 623.0±80.9 Bqkg-1 respectively. Radium equivalent activities of residue samples were calculated up to 1241.8±42.4 Bq/kg. Maximum activity concentration index and alpha index were found 4.2 and 4.0 respectively. The annual effective doses of four residue samples were calculated equal or above permitted dose rate for public, i.e. 1mSv/y.
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    Activity concentrations of 226Ra, 232Th, 40K and 137Cs radionuclides in Turkish medicinal herbs, their ingestion doses and cancer risks
    (Taylor and Francis, 2014-11) Parmaksız, Aydın; Ağuş, Yusuf; AAH-5187-2020; 0000-0003-4000-5175; TAEK-SANAEM
    Twenty-two medicinal herb samples, each representing a distinct species, were collected from Turkish markets and measured by the gamma spectrometric method. The activity concentration of 226Ra in medicinal herbs was found in the range of minimum detectable activity (MDA) and 15.1 ± 2.2 Bqkg−1. The activity concentration of 232Th ranged from MDA values to 3.5 ± 0.8 Bqkg−1. The activity concentration of 40K varied between 50.0 ± 16.8 and 1311.5 ± 57.3 Bqkg−1. All 137Cs activity concentrations of medicinal herbs were found to have lower than MDA values. The bone surface dose, lower large intestine and colon doses were found to be 182.9, 18.8 and 18.7 µSvy−1, respectively. The highest committed effective dose originated from the annual ingestion of 1 kg medicinal herb was calculated notably low as 9.0 µSv. The cancer risk of ingestion of medicinal herbs was found to be small enough to be neglected. The selected Turkish medicinal herbs are considered safe for human consumption.
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    Comprehensive data concerning cosmic radiation doses at ground level and in-flights for Turkey
    (Oxford University Press, 2016-12) Parmaksız, Aydın; AAH-5187-2020; 0000-0003-4000-5175
    Cosmic radiation doses of individuals living in 81 cities in Turkey were estimated by using CARI-6 software. Annual cosmic radiation doses of individuals were found to be between 308 and 736 µSv y−1 at ground level. The population-weighted annual effective dose from cosmic radiation was determined to be 387 µSv y−1 for Turkey. Cosmic radiation doses on-board for 137 (60 domestic and 77 international) flights varied from 1.2 to 83 µSv. It was estimated that six or over long-route round-trip air travels may cause cosmic radiation dose above the permissible limit for member of the public, i.e. 1 mSv y−1. According to the assumption of flights throughout 800 h on each route, cosmic radiation doses were found to be between 1.0 and 4.8 mSv for aircrew.
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    Işınlamanın süne zararına uğramış buğday ve unun kalitesi özellikleri üzerine etkisi
    (Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, 2020) Uygun, Mine; Ergun, Ece; Köseoğlu, Turhan; Özderen, Tülin; Pehlivan, Aliye; Kaplan Evlice, Asuman; Şanal, Tugay; TAEK-Radyasyon ve Hızlandırıcı Teknolojileri Dairesi Başkanlığı
    Buğday, beslenmemizde önemli bir yer tutar. Süne, buğday verimini ve kalitesini etkileyen en önemli zararlıdır. Sünenin, buğday üzerine beslenmek için bıraktığı salgısında bulunan proteolitik enzim, proteinlerin hidrolizasyonuna neden olur. Süne emgi oranının %3.5’i geçmesi halinde buğday, yemlik olarak değerlendirilir. Tarım ve Orman Bakanlığı, Tarla Bitkileri Merkez Araştırma Enstitüsü Müdürlüğü, Gıda Teknolojisi Bölümü ile birlikte yürüttüğümüz bu çalışmada, belirli oranlarda süneli buğday içeren örnekler (% 0, 2, 3.5, 5, 10 ve 15) farklı dozlarda ışınlanarak (0,1,3,5,8 ve 10 kGy), ışınlamanın nispi (rölatif) proteolitik enzim aktivitesini azaltmada etkisi araştırılmıştır. Işınlanmamış örneklerde süne emgi oranı arttıkça rölatif proteaz aktivitesinin arttığı görülmüştür. Işınlamanın, 8 kGy ışınlama dozuna kadar proteaz aktivitesini azalttığı belirlenmiştir. 8 kGy’e kadar uygulanan dozlarda ise %5 süne emgi oranına kadar oluşan proteolitik enzim aktivitesini azaltmada etkili olduğu belirlenmiştir.
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    Measurement of enhanced radium isotopes in oil production wastes in Turkey
    (Elsevier, 2015-03) Parmaksız, Aydın; Ağuş, Yusuf; Bulgurlu, Figen; Bulur, Emine; Öncü, Tolga; Özkök, Yücel Özer; AAH-5187-2020; /0000-0003-4000-5175; TAEK-SANAEM
    Gamma dose rates of oil production equipment and wastes were measured externally by survey meter. They were found to be between 0.2 μSv h−1 and 25.7 μSv h−1. Activity concentrations of radium isotopes in crude oil, scale, sludge, contaminated soil and water samples were determined by gamma spectrometric method. Activity concentrations of 224Ra, 226Ra and 228Ra in samples varied from MDA to 132,000 Bq kg−1. Radium isotopes enriched up to 14,667 times in scale samples. The highest value of 226Ra was found to be 35,122 ± 1,983 Bq kg−1 for sludge samples. Activity concentrations of a considerable number of samples were found to be higher than the exemption level recommended by IAEA. Measurement results revealed that oil production wastes caused soil contamination up to 70,483 Bq kg−1. They may pose a radiological risk for workers and members of the public.
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    Measurement of naturally occurring radionuclides in geothermal samples and assessment of radiological risks and radiation doses
    (Oxford University Press, 2013-12) Parmaksız, Aydın; AAH-5187-2020; 0000-0003-4000-5175; TAEK-SANAEM
    Total of 26 geothermal water and their residues collected from six well in the geothermal power plant territory were measured by gamma-ray spectrometry. Apart from two geothermal water samples, all geothermal water samples were found below the minimum detectable activity (MDA) values. 226Ra activity concentrations in residue samples were measured from 40±4 Bq kg-1 to 2694±85 Bq kg-1. 232Th activity concentration of residue samples are varying from 33±4 Bq kg-1 to 2388±85 Bq kg-1. 40K activity concentrations of residue samples are ranged between MDA to 967±30 Bq kg-1. The radium equivalent activities of samples are varied from 91±8 Bq kg-1 to 6161±46 Bq kg-1. The annual effective doses of residues were calculated lower than permitted dose rate for public, i.e. 1 mSv y-1. However it was found that if parameter values are changed additional annual effective doses can rise over the reference level of 1 mSv.