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    Wyświetlanie 1-6 z 6
    Tytuł:
    Sorption and migration of Cs, Sr, and Eu in gypsum - groundwater system
    Autorzy:
    Alhassanieh, O.
    Mrad, O.
    Ajji, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/147892.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    distribution
    cesium
    europium
    strontium
    gypsum
    groundwater
    Opis:
    The distribution of 137Cs, 152Eu, and 85Sr in a solid/aqueous system, gypsum in contact with groundwater, was investigated using gamma-spectrometry. The sorption and migration of the radionuclides were investigated. The aqueous phase was characterized using instrumental neutron activation analysis (INAA) and high performance liquid chromatography (HPLC). The solid phases were characterized using X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The investigations included three kinds of gypsum: mineral, commercial, and own prepared gypsum. The influence of some parameters on sorption/migration of the radionuclides were studied, such as contact time, pH, and concentrations of concurrent elements. The effect of element concentration was also investigated. The results show the ability of gypsum to keep Sr and Eu in the solid phase in all three cases. The incorporation of Cs in the solid phase depends on the conditions and used materials, and varies between 93 and 97%.
    Źródło:
    Nukleonika; 2012, 57, 1; 125-131
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on concentration of some heavy metals and strontium 90Sr and cesium 137Cs isotopes in bottom sediments of selected lakes of Łęczyńsko-Włodawskie Pojezierze
    Autorzy:
    Solecki, J.
    Reszka, M.
    Chibowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148507.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    strontium
    cesium
    lakes
    sedimentes
    haevy metals
    Opis:
    Research on concentration of radionuclides and heavy metals in bottom sediments of three different lakes is presented. The lakes were located in the vicinity of the National Park in the Lublin (Poland) region. Bottom sediments were collected from various depths. In all studied sediment, sample concentration of 90Sr and 137Cs isotopes ranged from 2.07 11.76 to 5.67 67.7 Bq/kg, respectively. The amount of radioactive 137Cs increased with depth of the lake. The same dependence for 90Sr was not observed. The level of radioactivity originated from natural isotopes was much lower in bottom sediments than that measured in related soils. Most of radioactivity in bottom sediments comes from anthropogenic isotopes.
    Źródło:
    Nukleonika; 2006, 51,suppl.2; 33-37
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural zeolite as a replacement for resin in the cation exchange process of cesium on post-irradiated nuclear fuel
    Autorzy:
    Ginting, Aslina Br.
    Siti, Amini
    Noviarty, -
    Yanlinastuti, -
    Nugroho, Arif
    Boybul, -
    Powiązania:
    https://bibliotekanauki.pl/articles/1841644.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    zeolites
    resin
    cation exchange
    cesium
    nuclear fuel
    Opis:
    Characterization of natural salts from Bayah, Lampung, and Tasikmalaya, Indonesia has been carried out as a substitute for synthetic resins. The characteristics include zeolite activation with NH4Cl, and heated at 200C, the bond stability test of 137Cs-zeolite, chemical composition analysis, surface area, pore size, analysis of Cs cation exchange capacity (CEC), diffusion coeffi cient (Di), activation energy (Ea), and absorption of three zeolites. To do this, pipette 50 l of a standard solution of 137Cs from the National Institute of Standards and Technology (NIST), put in, 2 ml of 0.1 N HCl, and then add 1 g of zeolite and stir each for 1, 2, 3, 4, 5, and 24 h. Based on this stirring time, the 137C isotope will exchange ions with NH4-zeolite to 137Cs-zeolite in the solid phase. The content of 137Cs in 137Cs-zeolites (solid phase) was analysed using a gamma spectrometer. The results of the chemical composition analysis showed that the character of zeolite from Lampung has a Si/Al ratio, with a CEC value of 1.448 mEq/g which is greater than Bayah and Tasikmalaya, while the Di and Ea values for the three select types were obtained almost the same. Moreover, the stability test of the Cs ion bond with zeolite showed no signifi cant release of Cs ions from the zeolite structure. It can be concluded that the three soloists tested that the zeolite from Lampung has better characters. The results of 137Cs isotope separation in 150 l of U3Si2/Al fuel solution post-irradiation using zeolite from Lampung and Dowex resins obtained almost the same recovery around 98–99%, so it can be concluded that zeolite from Lampung can be used as a substitute for synthetic resin in the cation exchange process for the 137Cs isotope in nuclear fuel post-irradiated.
    Źródło:
    Nukleonika; 2021, 66, 1; 11-19
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Migration of strontium, cesium, europium and uranium from poly(methyl styrene)- and polystyrene - phosphate composites prepared using gamma radiation
    Autorzy:
    Alhassanieh, O.
    Ajji, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146616.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    poly(methyl styrene)
    polystyrene
    composites
    distribution
    radionuclide
    europium
    strontium
    cesium
    uranium
    Opis:
    Composites consisting of natural phosphate powder and two monomers (styrene or methyl styrene) have been prepared by means of gamma irradiation. The polymerization reaction was followed up using a thermogravimetric analyzer (TGA) to determine the conversion of the polymerization. Differential scanning calorimeter (DSC) was used to locate and determine the glass transition temperature (Tg) of the prepared samples. The distribution of 137Cs, 152Eu, 85Sr and 238U in a solid-aqueous system, composites of phosphate-poly(methyl styrene) and of phosphate-polystyrene in contact with groundwater, was investigated using alfa-spectrometry and fluorometry. The effects of contact time, pH, and the concentration of concurrent element (Ca) were studied. The results were compared with earlier results with phosphate alone in the solid phase. The ability of the produced composites to keep the studied radioisotopes in the solid phase is much higher than in the mineral phosphate. This improvement is more remarkable for strontium and cesium than for europium and uranium, due to their high element ratio in the solid phase in phosphate experiments.
    Źródło:
    Nukleonika; 2012, 57, 3; 369-374
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plutonium and 137Cs in forest litter: an approximate map of plutonium from Chernobyl deposition in North-eastern and Eastern Poland
    Autorzy:
    Brudecki, K.
    Suwaj, J.
    Mietelski, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148124.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plutonium
    cesium
    Chernobyl
    hot particles
    radioactive contamination
    map of deposition plutonium
    Opis:
    The present article contains information about the activities and origin of 137Cs, 238Pu and 239+240Pu in the North-eastern Poland. Analyzed samples were collected in 59 locations where forest litter A0 and humus A1 were collected in 1991. An approximate map of the Chernobyl fallout component 239+240Pu was prepared on the basis of received results. The largest Chernobyl 239+240Pu contamination occurred in north-eastern and eastern part of the investigated area, reaching 22.1š1.6 Bqźm–2.
    Źródło:
    Nukleonika; 2009, 54, 3; 199-209
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rapid estimation of environmental radioactivity surrounding Xiangshan uranium deposits, Jiangxi province, Eastern China
    Autorzy:
    Gan, N.
    Cen, K.
    Ye, R.
    Li, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/148900.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma dose rate
    indoor radon
    water radon
    cesium
    annual effective dose
    Xiangshan uranium deposit
    Opis:
    The surveys of terrestrial gamma dose rate, radon concentration indoor and in water and specific activity of radionuclides of soil were carried out in 14 villages and a town in Xiangshan uranium deposit and surrounding area, Jiangxi province, Eastern China, in 2017–2018, using a scintillator dosemeter, an ionization chamber and a high-purity germanium gamma spectrometer to study radiation status in these places after remediation. A radioactive hot spot was discovered in a village near the mining office, where specific activity of 238U, 226Ra, 232Th and 137Cs of soil was as high as 1433 ± 76 Bq/kg, 1210 ± 62 Bq/kg, 236 ± 13 Bq/kg and 17 ± 1.1 Bq/kg, respectively. The dose rate on a waste rock heap was about 2423 nGy/h. Approximately 50% of the houses in a village near the uranium mining site had radon concentrations that exceeded 160 Bq/m3 . There was a significant positive correlation between indoor radon concentration and outdoor gamma dose rate (R2 = 0.7876). The abnormal radon concentration was observed in a rising spring sample providing residents with tap water up to 127.1 Bq/l. Four tap water samples and three of five well water samples exceeded the limit of radon concentration of drinking water in China (11.1 Bq/l). The mean annual effective doses from gamma dose rate data were 0.86 mSv/y and 1.13 mSv/y for indoor radon. The study shows that there are some radioactively contaminated places surrounding the Xiangshan uranium mine. The local outdoor dose rate averages may be used to estimate local indoor radon concentrations.
    Źródło:
    Nukleonika; 2018, 63, 4; 113-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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