Makale

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Browsing Makale by All Authors "Ağuş, Yusuf"

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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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    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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    Natural radioactivity of a copper-zinc mine with a production facility in Türkiye and radiological consequences of the usage of tailing as a concrete additive
    (Springer, 2023-01-08) Parmaksız, Aydın; Özkök, Yücel Özer; Ağuş, Yusuf; AAH-5187-2020; 0000-0003-4000-5175; TENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
    The dose rates of an underground copper-zinc mine and the radioactivities of collected samples were measured using a surveymeter and a gamma-ray spectrometer. There was no significant difference found between mine dose rates and background radiation in the region. The average activity concentrations of 226Ra, 232Th, and 40K in tailing samples were found to be 27%, 83%, and 71% higher than in ores, respectively. It was determined that a miner who worked in the mine for a year and was exposed to the natural radiation of the mine could be exposed to a radiation dose of less than 1 mSv. The annual radiation dose of a person living in a standard concrete room with a certain amount of tailing added to the concrete content was calculated to be 202.2 μSvy-1. Using tailings as concrete additives can help reduce waste released into the environment and make better use of natural resources.