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    Wyświetlanie 1-6 z 6
    Tytuł:
    Radiation chemistry of radioactive waste to be stored in the salt mine repository
    Autorzy:
    Zagórski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/148590.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dehydrogenation
    ionization spurs
    radioactive waste
    radiolysis of polymers
    repository chemistry
    Opis:
    Different aspects of radiation chemistry connected with long storage of radioactive waste are discussed. More details are given on the dehydrogenation of organic, and in particular polymeric waste, contaminated with transuranium nuclides. Determinations of radiation yields of hydrogen from typical waste were made, indicating limits of safe activities tolerable. No danger of chain reactions of hydrogen release was detected.
    Źródło:
    Nukleonika; 2006, 51,suppl.2; 87-92
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation chemistry in exploration of Mars
    Autorzy:
    Zagórski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/147866.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    carbon dioxide chemistry
    cosmic rays
    ionization spurs
    Martian regolith
    origins of life
    planetary system exploration
    radiation chemistry
    Opis:
    Problems of exploration of Mars are seldom connected with radiation research. Improvements in such approach, more and more visible, are reported in this paper, written by the present author working on prebiotic chemistry and origins of life on Earth. Objects on Mars subjected to radiation are very different from those on Earth. Density of the Martian atmosphere is by two orders smaller than over Earth and does not protect the surface of Mars from ionizing radiations, contrary to the case of Earth, shielded by the equivalent of ca. 3 meters of concrete. High energy protons from the Sun are diverted magnetically around Earth, and Mars is deprived of that protection. The radiolysis of martian "air" (95.3% of carbon dioxide) starts with the formation of CO2 +, whereas the primary product over Earth is N2 + ionradical. The lack of water vapor over Mars prevents the formation of many secondary products. The important feature of Martian regolith is the possibility of the presence of hydrated minerals, which could have been formed milliards years ago, when (probably) water was present on Mars. The interface of the atmosphere and the regolith can be the site of many chemical reactions, induced also by intensive UV, which includes part of the vacuum UV. Minerals like sodalite, discovered on Mars can contribute as reagents in many reactions. Conclusions are dedicated to questions of the live organisms connected with exploration of Mars; from microorganisms, comparatively resistant to ionizing radiation, to human beings, considered not to be fit to manned flight, survival on Mars and return to Earth. Pharmaceuticals proposed as radiobiological protection cannot improve the situation. Exploration over the distance of millions of kilometers performed successfully without presence of man, withstands more easily the presence of ionizing radiation.
    Źródło:
    Nukleonika; 2005, 50,suppl.2; 59-63
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possible role of radon in prebiotic chemistry and in early evolution of Life on Earth
    Autorzy:
    Zagórski, Z. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148902.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    great oxidation event
    ionizing radiation
    prebiotic chemistry
    radon
    thoron
    uranium
    Opis:
    Radon in the environment of early Earth was present in sites, determined by location of deposits of uranium, in very different geological formations. According to the decay of uranium-238, the total production of radon at the beginnings was twice as high as now and was continuously diminishing to the present levels. This nuclide could not play as big a role as do radioactive elements connected with the presence of high concentration of 235U, which was high enough in some places to give rise to formation of natural nuclear fission reactors (e.g. Oklo phenomenon in Africa). The main role of ionizing radiation in prebiotic chemistry and biological evolution was played by low LET (linear energy transfer) radiations, as deep penetrating sources of external energy. High LET radiations are of low penetration and could act only superficially. Radon is an exception, due to its easy transfer in the air. Therefore, it could play a role already in the cases of these early organisms which exhibited the gaseous exchange of chemical compounds with the surrounding atmosphere. The action was destructive, but, on the other hand, was also mutagenic. Nevertheless, the general quantitative effect of radon on the global scale could not be larger than of other radioactive nuclides. Presented considerations are part of the chapter by the present author on the role of nuclear and radiation chemistry in astrobiology, in the monograph published by American Scientific Publishers [1].
    Źródło:
    Nukleonika; 2010, 55, 4; 555-558
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation effects in polypropylene/polystyrene blends as the model of aromatic protection effects
    Autorzy:
    Głuszewski, W.
    Zagórski, Z. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147686.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    energy transfer
    polypropylene
    polystyrene
    protection effect
    radiation grafting
    Opis:
    A technically useful composition containing polypropylene (PP) as a principal constituent, expected to be working or to be processed in ionizing radiation field, e.g. for sterilization, has to be protected from undesired radiolysis resulting in radiation damage. Usually, conventional additives are used which are generally effective, especially when containing aromatic groups. They can be sometimes unacceptable, e.g. in medical applications. Polystyrene (PS) has been investigated as a protective component, in analogy to the classical case of cyclohexane/benzene system. Mechanical mixing of both polymers showed to be of modest effect, but two other procedures, of soaking polypropylene powder with polystyrene dissolved in styrene, or soaking with styrene and gamma preirradiation with resulting grafting (G = 12000 effects/100 eV), resulted in the composition of improved resistance towards radiation. The energy transfer, which explains the effect, is extended at a distance of 8-12 mers of polypropylene. The investigations have been made by gas chromatography and diffuse light reflection spectrophotometry (DRS), after 10 MeV electron beam irradiations.
    Źródło:
    Nukleonika; 2008, 53, suppl. 1; 21-24
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thorium nuclear fuel - thoron aspect
    Autorzy:
    Zagórski, Z. P.
    Głuszewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148763.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    CR-39
    nuclear fuel
    radon-220
    radon-222
    thorium fuel
    thoron
    Opis:
    The communication reports a serious complication connected with preparation, storage and transportation of fuel for thorium and uranium/thorium nuclear reactors. Whereas uranium fuel of any degree of enrichment is free from radium, which produces radon-222, thorium itself produces thoron (radon-220). Measurement of thoron by a routine ionization-chamber device around a small sample of 2 g thorium dioxide shows already the health endangerment situation. The presence of thoron is also confirmed by a typical solid state dosemeter (polymer CR-39), exposed to the air around ThO2 and etched afterwards with warm NaOH solution. The unavoidable presence of thoron can cause increase of price of production of nuclear fuel, demanding special approach to the method of manufacture.
    Źródło:
    Nukleonika; 2010, 55, 3; 407-408
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomorphological settings of Polish research areas on Spitsbergen
    Autorzy:
    Zwoliński, Z.
    Giżejewski, J.
    Karczewski, A.
    Kasprzak, M.
    Lankauf, K. R.
    Migoń, P.
    Pękala, K.
    Repelewska-Pękalowa, J.
    Rachlewicz, G.
    Sobota, I.
    Stankowski, W.
    Zagórski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/295146.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    polar landform
    polar geomorphology
    glacial relief
    postgalacial relief
    Polish geomorphological research
    Spitsbergen
    Opis:
    Paper described geomorphological characteristics of landform sets which occur on research areas investigated by Polish geomorphologists on Spitsbergen. These area involve four areas along the western coast of Spitsbergen, i.e. vicinities of the Kaffiøyra, the Werenskioldbreen, the Calypsostranda, and the Hornsund, as wel as one area located in the central part of Spitsbergen, i.e. vicinity of Billefjord with special emphasis on surroundings of the Petuniabkukta. Landforms are characterized in different morphogenetic terms, mainly glacial, peryglacial, deundational, slope, fluvial, even eolian factors and processes.
    Źródło:
    Landform Analysis; 2013, 22; 125-143
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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