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Wyszukujesz frazę "radionuclide" wg kryterium: Temat


Tytuł:
Target preparation of RbCl on a copper substrate by sedimentation method for the cyclotron production of no-carrier-added 85Sr for endotherapy
Autorzy:
Sadeghi, M.
Alipoor, Z.
Kakavand, T.
Powiązania:
https://bibliotekanauki.pl/articles/148632.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
rubidium chloride
target
sedimentation
radionuclide
Opis:
85Sr was produced via the 85Rb(p,n)85Sr reaction. Rubidium chloride deposition on copper substrate was carried out via the sedimentation method in order to produce strontium-85. Optimum conditions were achieved as a result of several repeated experiments with different amount of ethyl cellulose (EC) and acetone. 520 mg of RbCl, 208 mg of EC 4 mL of acetone were used to prepare a layer of enriched rubidium chloride of 11.69 cm2 area and 62.2 mg/cm2 thickness. Target quality control was done by a SEM photomicrograph and a thermal shock test. The deposited target was irradiated at a 20 ěA current and a 15 MeV proton beam for 30 min. No degradation was observed. The RbCl surface following bombardment was white, except the central area that was light brown and also without any crack or peeling off.
Źródło:
Nukleonika; 2010, 55, 3; 303-306
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PRRT as an alternative method of treatment in patient with glucagonoma syndrome: A case report
Autorzy:
Popławska-Kita, A.
Szyszkowska, A.
Brelska, P.
Kowalczuk, M.
Szostek, A.
Popławski, Ł.
Siewko, K.
Szelachowska, M.
Kamiński, G.
Werel, D.
Górska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1917699.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Glucagonoma
tumor
peptide receptor radionuclide therapy
Opis:
Introduction: Glucagonoma is a rare pancreatic neuroendocrine tumor derived from alpha-cells of the islet of Langerhans. Due to oversecretion of glucagon it is associated with a characteristic paraneoplastic phenomenon, called glucagonoma syndrome, which consists of necrolytic migratory erythema (NME), weight loss, diabetes mellitus, diarrhea, normochromic normocytic anemia, deep vein thrombosis or pulmonary embolism and neuropsychiatric disturbances. Treatment modalities include surgical removal of tumor, somatostatin analogs and peptide receptor radionuclide therapy (PRRT). Case report: We present a case of 61-year-old woman diagnosed with glucagonoma in April 2012. Initially, body-caudal pancreatomy and resection of regional lymph nodes were performed. Five months after surgery, a PET-CT scan detected pathological mass with expression of somatostatin receptors in pancreatic body and metastases to regional lymph nodes. What is more, since April 2014 the patient had complained about persistent pruritus of the entire body. At present, due to the nonsurgical pancreatic mass and metastases she is treated with somatostatin analogs and PRRT. During this therapy the pruritus had decreased and currently there is no sign of cutaneous disease. Moreover, reduction of tumor size was obtained. Conclusions: PRRT may reduce tumor size and by reducing bothersome symptoms substantially improve the quality of life in patients with SSTR-positive tumors
Źródło:
Progress in Health Sciences; 2016, 6(1); 209-214
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The National Standard Unit of Radionuclide Activity and the related standards in Poland
Autorzy:
Chyliński, A.
Broda, R.
Radoszewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/148541.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
standards
radionuclide
radioactivity
coincidence
iquid scintillator
Opis:
The idea of functioning and technical realization of the National Standard Unit of Radionuclide Activity established in Poland by President of the Central Office of Measures is presented in this paper. The Radioisotope Centre POLATOM has been appointed as depositary of that National Standard. The detection circuits as well as the absolute methods of measurements used to realize the standard unit are described. Application of a liquid scintillation technique was emphasized, and the determination accuracy of measurements has been presented. All kinds of the secondary standards, prepared in the RC POLATOM for application in isotope laboratories of nuclear medicine and in industrial and scientific centres, are related to the National Standard by a chain of presented comparisons. Relationship between the National Standard Unit of Radionuclide Activity and the international system of standards has been realized in the RC POLATOM by taking part in international comparisons of the measurement results.
Źródło:
Nukleonika; 2003, 48, 1; 51-55
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compact cyclotrons for the production of tracers and radiopharmaceuticals
Autorzy:
Paans, A.
Powiązania:
https://bibliotekanauki.pl/articles/146155.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
positron emission tomography (PET)
cyclotron
radionuclide production
Opis:
Positron Emission Tomography (PET) is a method for determining biochemical and physiological processes in vivo in a quantitative manner. The most commonly used radionuclides are 11C, 13N, 15O and 18F, with respective half-lives of approximately 20 min, 10 min, 2 min, and 110 min. 18F labeled FDG (fluoro-2-deoxy-D-glucose) is now the most frequently used radiopharmaceutical and finds its application prominently in the field of oncology. Originally, the production of these radionuclides was performed with the existing accelerators, designed for nuclear physics, but with increasing interest in the PET methodology specially designed PET-production cyclotrons became available. The nuclear reactions involved are (p,n), (d,n), (p,a) and (d,a) and the thresholds for the nuclear reactions involved are 5 to 6 MeV. Based on these values and on other parameters, a proton 15 to 20 MeV cyclotron is often chosen. Since the half-life of a radionuclide limits the production time, the maximum beam current is an important parameter, together with the target construction, for the ultimate yield obtainable. In the development of special PET production cyclotrons, attention has also been paid to improve the extraction efficiency and the possibility of multiple extractions by designing negative ion cyclotrons. Commercial cyclotrons can often be acquired as an easy to operate integrated radionuclide production unit including targetry and some units. Regional FDG factories are nowadays being created to fulfil the demand for PET radiopharmaceutics. The possible choices in commercially available cyclotrons for the production of PET radionuclides will be discussed.
Źródło:
Nukleonika; 2003, 48,suppl.2; 169-172
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The inflow of 234U and 238U from the River Odra drainage basin to the Baltic Sea
Autorzy:
Skwarzec, B.
Tuszkowska, A.
Borylo, A.
Powiązania:
https://bibliotekanauki.pl/articles/47957.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
Odra River
Polska
Szczecin Lagoon
concentration
drainage basin
inflow
natural radionuclide
radionuclide
trace element
uranium
water sample
Opis:
In this study the activity of uranium isotopes 234U and 238U in Odra river water samples, collected from October 2003 to July 2004, was measured using alpha spectrometry. The uranium concentrations were different in each of the seasons analysed; the lowest values were recorded in summer. In all seasons, uranium concentrations were the highest in Bystrzyca river waters (from 27.81±0.29 Bq m−3 of 234U and 17.82±0.23 Bq m−3 of 238U in spring to 194.76±3.43 Bq m−3 of 234U and 134.88 ± 2.85 Bq m−3 of 238U in summer). The lowest concentrations were noted in the Mała Panew (from 1.33±0.02 Bq m−3 of 234U and 1.06±0.02 Bq m−3 of 238U in spring to 3.52 ± 0.05 Bq m−3 of 234U and 2.59 ± 0.04 Bq m−3 of 238U in autumn). The uranium radionuclides 234U and 238U in the water samples were not in radioactive equilibrium. The 234U/238U activity ratios were the highest in Odra water samples collected at Głogów (1.84 in autumn), and the lowest in water from the Noteć (1.03 in winter and spring). The 234U/238U activity ratio decreases along the main stream of the Odra, owing to changes in the salinity of the river’s waters. Annually, 8.19 tons of uranium (126.29 GBq of 234U and 100.80 GBq of 238U) flow into the Szczecin Lagoon with Odra river waters.
Źródło:
Oceanologia; 2010, 52, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological analysis of heavy metal and radioactivity potential of Holocene sediments in Iznik Lake
Autorzy:
Yumun, Zeki U.
Kam, Erol
Powiązania:
https://bibliotekanauki.pl/articles/146352.pdf
Data publikacji:
2019
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Iznik Lake
heavy metals
radionuclides
geochemical analyses
radionuclide determination
Opis:
In this study, the heavy metal and radioactive properties of Iznik Lake were investigated. Concentration values of the first (Ag, Bi, Mo, Sn, Se, Zn, As, B, Cd, Co, Cr, Cu, Ni, Pb, Pt and Sb) and second (Na, Mg, K, Ca, P, S, Fe, Al and Mn) group of elements in borehole 1 (BH-1) drilling did not show much variation from the top to the bottom of the drilling. Concentration values of the fi rst group of elements in borehole 2 (BH-2) drill samples decreased at higher levels of drilling. In addition, natural and anthropogenic radionuclides were measured by gamma spectrometry, and the results of environmental natural radioactivity of Iznik Lake and its surroundings were determined. In the measurement results, Ra-226 was found to be below the world average value at all locations. It is assumed that the determination of K-40 values above the average values was due to agricultural activities carried out intensively in the study area. Th-232 values were found to be below the world average value in drilling samples; Cs-137 values were below the background level in all samples. According to these results, the study area does not contain any unnatural radioactivity.
Źródło:
Nukleonika; 2019, 64, 3; 103-109
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On release of radionuclides from a near-surface radioactive waste repository to the environment
Autorzy:
Gudelis, A.
Gorina, I.
Powiązania:
https://bibliotekanauki.pl/articles/146504.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
near-surface repository
radionuclides
groundwater
radionuclide release
forest environment
Opis:
A closed near-surface radioactive waste repository is the source of various radionuclides causing the human exposure. Recent investigations confi rm an effectiveness of the engineering barriers installed in 2006 to prevent the penetration of radionuclides to the environment. The tritium activity concentration in groundwater decreased from tens of kBq/l to below hundreds of Bq/l. The monitoring and groundwater level data suggest the leaching of tritium from previously contaminated layers of unsaturated zone by rising groundwater while 210Pb may disperse as a decay product of 226Ra daughters.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 551-555
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Usefulness of thoracic electrical bioimpedance in detection of ejection fraction changes
Autorzy:
Hartleb, M.
Rudzki, K.
Waluga, M.
Janusz, M.
Karpel, E.
Powiązania:
https://bibliotekanauki.pl/articles/71031.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
thoracic electrical bioimpedance
orthostasis
handgrip
postural change
radionuclide ventriculography
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of the Negative Impact on the Environment During the Extraction of Uranium By In-Situ Leaching
Autorzy:
Kryakhtunov, Alexander V.
Powiązania:
https://bibliotekanauki.pl/articles/2086430.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
geoecological characteristics
deposit area
uranium
radionuclide content
underground leaching
Opis:
The purpose of this study was a detailed analysis of all aspects related to the impact of objects and structures of the planned economic activity on the environment on the territory of the Semizbay deposit in the Republic of Kazakhstan. In the course of the work, the geoecological characteristics of the Semizbay deposit were presented. The analysis of data on the state of the components of the natural environment, based on the materials of earlier studies at the facility, was carried out. On the basis of the actual material, a list of priority pollutants subject to monitoring was compiled. The methodology and organization of the projected works are given. The types, conditions, scope of work were indicated. During the study, the following were carried out: soil sampling was carried out in the vicinity of the deposit, radiochemical analysis, and X-ray diffraction analysis. As a result of the study, a program of geoecological research was developed on the territory of the deposit: the content of radionuclides and the mineralogical composition of the sample were determined, which can become an alternative for further research on the territory of the enterprise.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 260--270
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the sediment deposition rates in the Kuwait Bay using 137Cs and 210Pb
Autorzy:
Al-Zamel, A.
Bou-Rabee, F.
Al-Sarawi, M.
Olszewski, M.
Bem, H.
Powiązania:
https://bibliotekanauki.pl/articles/148519.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
bottom sediments
sedimentation rate
unsupported 210Pb
137Cs radionuclide
Opis:
Five bottom sediment cores from the Kuwait Bay were dated using 210Pb and 137Cs radionuclides. For evaluating the sedimentation rate two methods were applied: geochronology with the constant rate of supply unsupported 210Pb (CRS model) and the Weibull distribution of anthropogenic 137Cs. The sedimentation rates in this region, calculated by the first method ranged from 0.24 to 0.39 cm/year, while the same rates obtained from 137Cs distribution were slightly lower: from 0.1 to 0.25 cm/year. These relatively small differences can be explained by additional input of the Chernobyl accident to the 137Cs inventory in the bottoms sediments of the Northern Hemisphere.
Źródło:
Nukleonika; 2006, 51,suppl.2; 39-44
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of internal exposure of nuclear medicine staff working with radioiodine in Poland
Autorzy:
Krajewska, Grażyna
Krajewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/21375376.pdf
Data publikacji:
2023-11-27
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
nursing
medical imaging
radionuclide imaging
radiation effects
radioisotope therapy
radioisotope scanning
Opis:
The iodine-131 (I-131) content in the thyroid of staff members working with this radionuclides has been measured with about 500 employees in about 25 hospital’s departments of nuclear medicine performing therapy and diagnosis of thyroid disease in Poland. The measurements were performed with portable detection unit for in situ measurements of radioiodine. This is consist with scintillation detector sodium iodine activated by thallium (NaI(Tl)) – battery-powered and portable tube base Multichannel Analyzer Canberra UniSPEC. Based on direct measurements of the iodine content, the effective dose equivalent for workers due to inhalation of I-131 was estimated. All individuals actively working with iodine show measurable amounts of this isotopes in their thyroids. The average measured activity in the thyroid of the nuclear medicine staff was found to be equal at average 550 Bq within the range 70 Bq–2.5 kBq. There is no apparent correlation between the measured I-131 levels and risk categories. Nevertheless the technical and nuclear medicine staff show higher I-131 thyroid level comparing to hospital services staff. Calculated maximum committed effective dose for particular exposed person is <10% of 20 mSv/year.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 5; 587-595
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of radionuclide migration and radiological human exposure at the closed near-surface radioactive waste repository
Autorzy:
Gudelis, A.
Nedveckaite, T.
Prokopčiuk, N.
Filistovič, V.
Remeikis, V.
Motiejunas, S.
Powiązania:
https://bibliotekanauki.pl/articles/148646.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
near-surface repository
engineering barriers
radionuclide migration
groundwater pathway
radiation protection
Opis:
The near-surface “RADON” type radioactive waste repository, installed in 1963 and designed to store radioactive waste formed in industry, medicine and scientific investigations, was closed in 1989 because it did not meet the requirements imposed on the radioactive waste disposal. A comparatively small amount of radioactive waste is stored in this repository, but the inventory comprises various kinds of waste: short-lived low-level radioactive waste, short-lived low and intermediate radioactive waste, long-lived intermediate and high-level radioactive waste. The possible site-specific radionuclide migration through the groundwater pathway as well as the human exposure are considered by the computer program RESRAD-OFFSITE in this paper. The analysis of the obtained data shows that out of all stored radionuclides only H-3, C-14 and Cl-36 exceeding the dose constraint of 0.2 mSv can be considered as dangerous. The monitoring carried out in the repository environment has shown the contamination of groundwater with radioactive tritium and a significant reduction of contamination after construction of additional protective engineering barriers. For the assessment of the contribution of separate site-specific parameters of the model taking into account uncertainties of the model and parameters to the annual effective dose, the computer code RESRAD-OFFSITE provides the possibility of applying the regression analysis. It has been determined that the aquifer lateral dispersion as well as the hydraulic gradient, the radionuclide activity concentration in the repository together with the rate of penetration into the environment and the precipitation amount have the largest influence on the assessment accuracy of annual effective doses.
Źródło:
Nukleonika; 2010, 55, 2; 251-259
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical preparations for atmospheric radioactivity monitoring
Autorzy:
Miyamoto, Y.
Oda, T.
Adachi, T.
Noguchi, H.
Nishimura, H.
Usuda, S.
Powiązania:
https://bibliotekanauki.pl/articles/147567.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
airborne dust
background activity
CTBT
environmental radioactivity
nuclear explosion
radionuclide monitoring
Opis:
To evaluate the suitability of a location for a radionuclide monitoring station of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) at Takasaki, Japan, the assessment was done in terms of the concentration of natural background radioactive nuclides in airborne dust and soil samples. The samples were taken four times at the proposed site and several points around the site, then their radioactivities were measured by gamma-ray spectrometry. For the airborne dust samples, only natural background radionuclides: 212Pb, 7Be and 214Pb were detected. The radioactivity concentrations of these radionuclides varied in four sampling periods but were almost the same as the previous measurements. For the soil samples, the concentration of an anthropogenic radionuclide, 137Cs, fluctuated among the different sampling points and periods, but the concentration of 40K was constant. These concentrations were 2 to 3 times lower than those of the soil taken at JAERI Tokai. Based on these results, the proposed site was evaluated and has been accepted by the CTBT Organization as a CTBT radionuclide monitoring station.
Źródło:
Nukleonika; 2001, 46, 4; 123-126
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:
Water Quality and Radionuclides Content Assessment of the Al-Najaf Sea: Case Study
Autorzy:
Zwain, Haider M.
Almurshedi, Kareem Radhi
Vakili, Mohammadtaghi
Dahlan, Irvan
Naje, Ahmed Samir
Powiązania:
https://bibliotekanauki.pl/articles/1839100.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
irrigation water
water quality assessment
salinity
sodicity
radionuclide
Al-Najaf Sea
Opis:
The Al-Najaf state is witnessing an increased economic development and attracting more investments that require the development of new areas and exploring new water resources. This study evaluates the quality of 12 surface water samples and groundwater from 12 wells for irrigation according to the salinity and sodicity hazards based on electrical conductivity (EC) and sodium adsorption ratio (SAR). In addition, the concentrations of radionuclides, which include Thorium (232Th), Uranium (238U), Potassium (40K) and Cesium (137Cs) were tested in four soil samples in the study area. It was found that the average values of pH, total hardness, Na, Ca, Mg, K, Cl, SO4, NO3 for groundwater and surface water were 8 and 6, 2287 and 4006 mg/L, 1140 and 1232 mg/L, 378 and 637 mg/L, 327 and 587 mg/L, 2 and 2 mg/L, 989 and 2007 mg/L, 1149 and 1325 mg/L, as well as 2 and 2 mg/L, respectively. From salinity and sodicity hazards analysis, the groundwater had EC of 5242 µS/cm and SAR of 61, whereas surface water had EC of 6253 µS/cm and SAR of 50. Furthermore, the concentrations of radionuclides, i.e. 232Th, 238U, 40K and 137Cs in the soil samples were found to be 11.02, 34.12, 544.45, and 1.6 Bq/kg, respectively. The concentrations of radionuclides were within the worldwide baseline, expect for 40K. The study concluded that both water sources are classified as very high salinity and sodium water (class C4-S4), and it cannot be used for irrigation, only suitable for the salt tolerant crops.
Źródło:
Journal of Ecological Engineering; 2021, 22, 2; 262-271
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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