Autor: Z. G. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Principles of safety use of radioiodine in the treatment of well-differentiated thyroid carcinoma (DTC)
Autorzy:: Kowalczyk, A
Krajewska, G.
Podgajny, Z.
Kamiński, G.
Powiązania:: https://bibliotekanauki.pl/articles/146638.pdf
Data publikacji:: 2008
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: well-differentiated thyroid carcinoma
radioiodine therapy
radioactive wastes
Opis:: The post-operative radioiodine treatment of patients with well-differentiated thyroid carcinoma decreases cancer death, tumor recurrences and development of distant metastases. The recommended dose of 131I ranging from 1.1 to 11.1 GBq. Because these doses are much higher than the permissible dose of 131I for outpatients (800 MBq), all patients are treated during hospitalization. In the Department of Endocrinology and Radioisotope Therapy from 1998 to the end of June 2008 694 patients have received at least one dose of 131I for DTC. Nowadays, cumulative yearly dose exceed 200 GBq. High doses of 131I may cause radiation exposure to personnel and environmental hazard. The last mentioned is caused mainly by radioactive liquid wastes with comprise washing water and excreta (urine, feces). In order to minimize this hazard radioactive liquid waste from isolated Radioisotope Therapy Unit are discharged into internal hospital sewage system and stored in 4 containers until 131I concentration decreases up to the recommended level.
Źródło:: Nukleonika; 2008, 53, suppl. 2; 95-97
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Radiation processing of polymers and semiconductors at the Institute of Nuclear Chemistry and Technology
Autorzy:: Zimek, Z.
Przybytniak, G.
Kałuska, I.
Powiązania:: https://bibliotekanauki.pl/articles/146107.pdf
Data publikacji:: 2006
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: electron beam accelerators
radiation processing
Opis:: R&D studies in the field of radiation technology in Poland are mostly concentrated at the Institute of Nuclear Chemistry and Technology (INCT). The results of the INCT works on polymer and semiconductor modification have been implemented in various branches of national economy, particularly in industry and medicine. Radiation technology for polymer modification was implemented in the middle of the 1970-ties. Among others, the processes of irradiation and heat shrinkable products expansion have been developed. The transfer of this technology to Polish industry was performed in the middle of the 1980-ties. The present study aims at the formulation of new PE composites better suited to new generation of heat shrinkable products, for example, a new generation of hot-melt adhesives has been developed to meet specific requirements of customers. Modified polypropylene was used for the production of medical devices sterilized by radiation, especially disposable syringes, to overcome the low radiation resistance of the basic material. Modified polypropylene (PP-M) has been formulated at the INCT to provide material suitable for medical application and radiation sterilization process. Modification of semiconductor devices by EB was applied on an industrial scale since 1978 when the INCT and the LAMINA semiconductor factory successfully adopted that technology to improve specific semiconductor devices. This activity is continued on commercial basis where the INCT facilities served to contract irradiation of certain semiconductor devices according to the manufacturing program of the Polish factory and customers from abroad.
Źródło:: Nukleonika; 2006, 51,suppl.1; 129-132
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Proposition of numerical modelling of BEC
Autorzy:: Utyuzh, O.
Wilk, G.
Włodarczyk, Z.
Powiązania:: https://bibliotekanauki.pl/articles/148445.pdf
Data publikacji:: 2006
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: hadronization
correlations
BEC
Opis:: We propose an extension of the numerical method to model effect of Bose-Einstein correlations (BEC) observed in hadronization processes which allows for calculations not only the correlation functions C2(Qinv) (onedimensional), but also the corresponding C2(Qx,y,z) (i.e., three-dimensional). The method is based on the bunching of identical bosonic particles in elementary emitting cells (EEC) in phase space in a manner leading to proper Bose- Einstein form of distribution of energy (this was enough to calculate C2(Qinv)). To obtain C2(Qx,y,z) as well as one has to add to it the symmetrization of the multiparticle wave function to properly correlate space-time locations of produced particles with their energy-momentum characteristics.
Źródło:: Nukleonika; 2006, 51,suppl.3; 105-108
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: How to model BEC numerically?
Autorzy:: Utyuzh, O.
Wilk, G.
Włodarczyk, Z.
Powiązania:: https://bibliotekanauki.pl/articles/147372.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: correlations
BEC
HBT
Opis:: A new method for numerical modelling of Bose-Einstein correlations observed in all kinds of multiparticle production processes is proposed.
Źródło:: Nukleonika; 2004, 49,suppl.2; 33-35
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Single particle spectra from information theory point of view
Autorzy:: Navarra, F.
Utyuzh, O.
Wilk, G.
Włodarczyk, Z.
Powiązania:: https://bibliotekanauki.pl/articles/147370.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: information theory
high energy collisions
MaxEnt
Opis:: Abstract It is demonstrated how to obtain the least biased description of a single particle spectra measured in all multiparticle production processes by using an information theory approach (known also as MaxEnt approach). The case of e+e annihilation in hadrons process is discussed in more detail as an example. Comparison between the MaxEnt approach and a simple dynamical model based on the cascade process is presented as well.
Źródło:: Nukleonika; 2004, 49,suppl.2; 19-21l
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Synthesis and characterization of iron oxide magnetic nanoparticles
Autorzy:: Surowiec, Z.
Budzyński, M.
Durak, K.
Czernel, G.
Powiązania:: https://bibliotekanauki.pl/articles/147402.pdf
Data publikacji:: 2017
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Mössbauer effect
superparamagnetic nanoparticles
Opis:: Small particles of magnetite, i.e. 7.5, 13.4 and 14.1 nm in diameter, were obtained by the method of co-precipitation. The crystal structure and size distributions were determined by means of transmission electron microscopy and X-ray diffraction. The magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy within the temperature range from 3 K to room temperature (RT). The Mössbauer study of magnetic nanoparticles reveals relaxation behaviour related to the existence of the superparamagnetic phase. The blocking temperature depends on the sizes of the nanoparticles and the ammonia concentration.
Źródło:: Nukleonika; 2017, 62, 2; 73-77
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Decomposition of toluene in air mixtures under electron beam irradiation
Autorzy:: Sun, Y.
Chmielewski, A. G.
Bułka, S.
Zimek, Z.
Powiązania:: https://bibliotekanauki.pl/articles/148028.pdf
Data publikacji:: 2009
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: toluene
4-chlorotoluene
decomposition
electron beam
Opis:: The model gases of toluene-air mixtures were prepared by blowing technical air into liquid toluene and then irradiated with an ILU-6 accelerator located at the Institute of Nuclear Chemistry and Technology (INCT), Poland. It was found that the decomposition efficiency of toluene increases with absorbed dose and decreases with initial concentration of toluene. At 14.5 kGy dose, the decomposition efficiencies of toluene were 50, 37 and 34.5% for the initial concentrations of toluene 32.0, 63.4 and 78.0 ppm, respectively. At 58.0 kGy dose, the decomposition efficiencies of toluene were 93.8 and 78.1%, the initial concentrations of toluene being 32.0 and 63.4 ppm, respectively. Benzaldehyde was identified as one of the by-products of toluene decomposition in an air mixture. The decomposition efficiency and by-product formation under EB irradiation were compared between toluene and 4-chlorotoluene.
Źródło:: Nukleonika; 2009, 54, 2; 65-70
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C
Autorzy:: Sadło, J.
Bugaj, A.
Strzelczak, G.
Sterniczuk, M.
Jaegermann, Z.
Powiązania:: https://bibliotekanauki.pl/articles/146101.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: aragonite
calcite
dosimetry
EPR spectroscopy
γ-irradiation
radicals
Opis:: In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3 – (orthorhombic symmetry, bulk and bonded to surface), CO3 3–, NO3 2–, O3 –, and in aragonite CO2 – (isotropic and orthorhombic symmetry) depending on the type of calcium carbonate used. For calcium carbonates enriched with 13C more detailed information about the formed radicals was possible to be obtained. In both natural (white coral) and synthetic aragonite the same radicals were identifi ed with main differences in the properties of CO2 – radicals. An application of Q-band EPR allowed to avoid the signals overlap giving the characteristics of radical anisotropy.
Źródło:: Nukleonika; 2015, 60, No. 3, part 1; 429-434
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Simulation of decomposition of dichloroethylenes (trans-DCE, cis-DCE, 1,1-DCE)/air under electron beam irradiation
Autorzy:: Sun, Y.
Chmielewski, G.
Bułka, S.
Zimek, Z.
Nichipor, H.
Powiązania:: https://bibliotekanauki.pl/articles/146568.pdf
Data publikacji:: 2007
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: trans-dichloroethylene
cis-dichloroethylene
1,1-dichloroethylene
electron beam
decomposition
mechanism
Opis:: On the basis of the experimental results, computer simulations of decomposition of dichloroethylenes for three isomers (trans-DCE, cis-DCE, 1,1-DCE) in air under electron beam were carried out. Computer code “Kinetic” and “Gear” method were used. Calculation results well agree with the experimental results. Decomposition efficiency of DCE is mainly determined by Cl- dissociated secondary electron attachment, followed by Cl radical addition reaction with DCE.
Źródło:: Nukleonika; 2007, 52, 2; 59-67
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Theoretical study of dose and dose rate effect on trichloroethylene (HClC=CCl2) decomposition in dry and humid air under electron beam irradiation
Autorzy:: Nichipor, H.
Yacko, S.
Sun, Y.
Chmielewski, A. G.
Zimek, Z.
Powiązania:: https://bibliotekanauki.pl/articles/146819.pdf
Data publikacji:: 2008
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: trichloroethylene
electron beam decomposition
computer simulation
Opis:: Experimental data related to C2HCl3 (TCE) removal in dry and humid (200-1000 ppm of H2O) air, respectively, in ambient conditions under electron beam irradiation in the dose range of 1-40 kGy has been published in the literature. Based on the experimental results a theoretical model of C2HCl3 decomposition was proposed for the kinetic mechanism of such process. The active radicals of Cl, O and OH play an important role in the decomposition of TCE. According to the calculations performed, the Cl- dissociative electron attachment predominates in the initial stage of C2HCl3 decomposition. Cl radical accelerates this degradation by chain process in both humid and dry air, respectively. The OH radical produced in humid air also enhances the decomposition process of TCE.
Źródło:: Nukleonika; 2008, 53, 1; 11-16
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Effect of hindered amine light stabilizers on the resistance of polypropylene towards ionizing radiation
Autorzy:: Przybytniak, G.
Mirkowski, K.
Rafalski, A.
Nowicki, A.
Legocka, I.
Zimek, Z.
Powiązania:: https://bibliotekanauki.pl/articles/148686.pdf
Data publikacji:: 2005
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: polypropylene
stabilizers
HALS
electron beam
apparent viscosity
nucleation agent
Opis:: The influence of hindered amine light stabilizers (HALSs) on physical and mechanical properties of irradiated and non-irradiated isotactic polypropylene (PP) was studied. The stabilizers under investigation were: Tinuvin 765 (T765) and Tinuvin 622 (T622) - derivatives of 1,2,2,6,6-pentamethyl piperidine and Chimassorb 944 (C944) - a derivative of 2,2,6,6-tetramethyl piperidine. It was found that the stabilizers reduce the amount of peroxyl radicals in the amorphous phase of PP. The irradiation with electron beam causes a drop of apparent viscosity both in the original and in the modified PP however the effect is smaller in the presence of HALSs. Admixture of T622 and T765 stabilizers increases the crystallization temperature of non-irradiated PP by about 8 10°C (measured by DSC) what results from the facilitated formation of a large number small microcrystals. It was concluded that HALSs initiate two opposite tendencies - chemical protection against damage initiated by free radicals and, simultaneously, physical enhancement of sensitivity towards irradiation by the increase of nucleation density. In the studied systems, the presence of maleic anhydride does not improve compatibility between the polymeric matrix and HALSs.
Źródło:: Nukleonika; 2005, 50, 4; 153-159
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Functionalization of polymer surfaces by radiation-induced grafting
Autorzy:: Przybytniak, G.
Kornacka, E. M.
Mirkowski, K.
Walo, M.
Zimek, Z.
Powiązania:: https://bibliotekanauki.pl/articles/146746.pdf
Data publikacji:: 2008
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: radiation grafting
EPR
radicals
radiation yield
Opis:: The mutual radiation grafting of acrylic acid (AAc) onto polyethylene (PE), polypropylene (PP) and polystyrene (PS) films was performed. At first stage of investigations, the influence of ionizing radiation on the trunk polymers was studied, i.e. the level of radicals stable at room temperature and radiation yield of evolved hydrogen were estimated for each polymer. The measurements were carried out using electron paramagnetic resonance (EPR) spectroscopy and gas chromatography (GC), respectively. Radiation yields of radicals as well as hydrogen emission increased in the following order PS < PP < PE. Under comparable conditions, the same relationship was found for the yield of radiation-induced grafting of AAc. A distinct correlation between content of radicals generated by ionizing radiation in polymeric matrices and grafting degree was confirmed for the studied materials. The effect of monomer and inhibitor concentrations on the efficiency of processes were studied as well.
Źródło:: Nukleonika; 2008, 53, 3; 89-95
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Influence of boundary effects on electron beam dose distribution formation in multilayer targets
Autorzy:: Kałuska, I.
Lazurik, V. T.
Lazurik, V. M.
Popov, G. F.
Rogov, Y. V.
Zimek, Z.
Powiązania:: https://bibliotekanauki.pl/articles/148556.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: absorbed dose
electron beam
simulation
Monte Carlo
software ModeStEB
dosimetry
Opis:: Computational dosimetry play a significant role in an industrial radiation processing at dose measurements in the product irradiated with electron beams (EB), X-ray and gamma ray from radionuclide sources. Accurate and validated programs for absorbed dose calculations are required for computational dosimetry. The program ModeStEB (modelling of EB processing in a three-dimensional (3D) multilayer flat targets) was designed specially for simulation and optimization of industrial radiation processing, calculation of the 3D absorbed dose distribution within multilayer packages. The package is irradiated with scanned EB on an industrial radiation facility that is based on the pulsed or continuous type of electron accelerators in the electron energy range from 0.1 to 25 MeV. Simulation of EB dose distributions in the multilayer targets was accomplished using the Monte Carlo (MC) method. Experimental verification of MC simulation prediction for EB dose distribution formation in a stack of plates interleaved with polyvinylchloride (PVC) dosimetric films (DF), within a packing box, and irradiated with a scanned 10 MeV EB on a moving conveyer is discussed.
Źródło:: Nukleonika; 2010, 55, 3; 363-368
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Ion exchange investigation for recovery of uranium from acidic pregnant leach solutions
Autorzy:: Danko, B.
Dybczyński, R. S.
Samczyński, Z.
Gajda, D.
Herdzik-Koniecko, I.
Zakrzewska-Kołtuniewicz, G.
Chajduk, E.
Kulisa, K.
Powiązania:: https://bibliotekanauki.pl/articles/147778.pdf
Data publikacji:: 2017
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: uranium recovery
acidic pregnant leach solution
ion exchange separation
Opis:: The article describes studies on the separation of uranium from acid pregnant leach solutions obtained from Polish uranium ores: dictyonema shales and sandstone rocks. Ion exchange chromatography was applied for uranium sorption, using commercially available, strongly basic anion exchanger, Dowex 1. In model experiments, the influence of degree of crosslinking of Dowex 1 on the efficiency of uranium extraction was investigated. The effect of H2SO4 concentration on the breakthrough curve of uranyl ions for the Dowex 1 resins, of different crosslinking: X4, X8 and X10, was examined. Unexpectedly high increase of exchange capacity of uranium was observed in case of Dowex 1X10. This gives potential opportunity of improving the effectiveness of uranium recovery process. Applying column packed with Dowex 1X10, ‘yellow cake’ with ca. 92% yield and high purity of recovered uranium was obtained. A block diagram of the procedure for uranium and lanthanides extraction from acidic leach liquor has been proposed.
Źródło:: Nukleonika; 2017, 62, 3; 213-221
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki