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    Wyświetlanie 1-8 z 8
    Tytuł:
    Biological efficiency of the Brookhaven Medical Research Reactor mixed neutron beam estimated from gene mutations in Tradescantia stamen hair cells assay
    Autorzy:
    Cebulska-Wasilewska, A.
    Schneider, K.
    Capała, J.
    Coderre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146139.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutrons
    relative biological efficiency
    Tradescantia
    Opis:
    The relative biological effectiveness of low energy neutrons for the induction of various abnormalities in Tradescantia stamen hair mutation (Trad-SH) assay was studied using two clones (T-4430 and T-02), heterozygous for flower color. Dose response relationships for gene mutations induced in somatic cells of Trad-SH were investigated after irradiation with a mixed neutron beam of the Brookhaven Medical Research Reactor (BMRR), currently used in a clinical trial of boron neutron capture therapy (BNCT) for glioblastoma. To establish the RBE (relative biological effectiveness) of the BMRR beam in the induction of various biological end-points in Tradescantia, irradiation with various doses of g-rays was also performed. After irradiation all plants were cultivated several days at Brookhaven National Laboratory (BNL), the transported to Poland for screening the biological end-points. Due to the post-exposure treatment, all plants showed high levels of lethal events and alteration of the cell cycle. Plants of clone 4430 were more reactive to post-treatment conditions, resulting in decreased blooming efficiency that affected the statistics. Slope coefficients estimated from the dose response curves for gene mutation frequencies allowed the evaluation of ranges for the maximal RBE values of the applied beam vs. g-rays as 6.0 and 5.4 for the cells of T-02 and T-4430, respectively. Estimated fraction of doses from neutrons and corresponding biological effects for the clones T-02 and T-4430 allowed to evaluate the RBE values for neutrons part in the beam as 32.3 and 45.4, respectively.
    Źródło:
    Nukleonika; 2000, 45, 2; 115-119
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutron emission parameters from the collapse of the condensed Z-pinch
    Autorzy:
    Anan'ev, S. S.
    Bakshaev, Y. L.
    Bryzgunov, V. A.
    Chernenko, A. S.
    Dan'ko, S. A.
    Kazakov, E. D.
    Klír, D.
    Korolev, V. D.
    Smirnova, E. A.
    Ustroev, G. I.
    Vikhrev, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/146662.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutrons
    energy distribution
    fast Z-pinch
    Opis:
    The parameters of neutron emission from the neck of the condensed Z-pinch, were measured at an S-300 installation (2 MA, 100 ns). Profiled loads with central parts made from microporous deuterated polyethylene (with a density of 100 mg/cm3) were used in the experiments. Neutron emission parameters were measured by the time-of-flight (TOF) method. Neutrons were registered using four flight bases with 10 scintillation detectors which were placed at two axial and two radial directions. It was found that the mean neutron energy, determined by the TOF method, turned out to be anisotropic. The average energy of neutrons emitted along the axis towards the cathode, was shifted to higher energy (2.6-2.8 MeV) and the average energy of neutrons emitted towards the anode, was shifted to lower energy (2.1-2.3 MeV) compared to the d-d reaction neutron energy 2.45 MeV. The average energy of neutrons, emitted in two opposite radial directions, was close to 2.45 MeV. The half-width of the energy distributions reconstructed for all directions was 400-500 keV. The analysis of the experimental results demonstrated that the found phenomena could be explained by a slowly decaying high energy tail in the energy distribution of colliding deuterons. The maximal neutron yield was of 6 x 109.
    Źródło:
    Nukleonika; 2012, 57, 3; 333-336
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical optimisation of the fission-converter and the filter/moderator arrangement for the Boron Neutron Capture Therapy
    Autorzy:
    Tracz, G.
    Dąbkowski, L.
    Dworak, D.
    Pytel, K.
    Woźnicka, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/148388.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    BNCT
    fission converter
    Fluka
    MCNP
    Monte Carlo
    neutrons
    Opis:
    The paper presents results of the numerical modelling of the fission-converter-based epithermal neutron source designed for a BNCT (Boron Neutron Capture Therapy) facility to be located at the Polish research nuclear reactor MARIA at Świerk. The unique design of the fission converter has been proposed due to a specific geometrical surrounding of the reactor. The filter/moderator arrangement has been optimised in order to moderate fission neutrons to epithermal energies and to get rid of both fast neutrons and photons from the therapeutic beam. The selected filter/moderator set-up ensures both the high epithermal neutron flux and the suitably low level of beam contamination. The elimination of photons originated in the reactor core is an exceptional advantage of the proposed design. It brings one order of magnitude lower gamma radiation dose than the permissible dose in such a type of therapeutic facility is required. The MCNP and FLUKA codes have been used for the computations.
    Źródło:
    Nukleonika; 2003, 48, 4; 177-185
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconsideration of thermonuclear possibilities of Z-pinches
    Autorzy:
    Vikhrev, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/147474.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fusion burn wave
    neutrons
    plasma focus
    Z-pinch
    Opis:
    The paper considers the Z-pinch as the basis for future thermonuclear fusion reactors. Experiments on Z-pinches always concern small and high temperature and a high density plasma regions that arise spontaneously in the Z-pinch neck. A burn wave might be initiated in the Z-pinch column if in this small plasma region a Lawson-like condition is fulfilled.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 9-12
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Inverse Reaction Cross Sections for Some Charged Particles Using the Optical Model Parameters
    Autorzy:
    Ahmed, Rasha S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193016.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Optical reaction cross-sections
    charged particles
    neutrons
    pre-equilibrium models
    Opis:
    p-nucleus, (_1^2)H-nucleus, (_1^3)H-nucleus, and (_2^4)He-nucleus inverse reaction cross sections have been determined using the optical model potentials in a wide range of target nuclei started from A=1 to A=232 using several incident particle energies ( E = 2, 8, 10, 20, and 40 MeV). In this work, a large number of optical model available parameters were used to calculate the inverse reaction cross section and compared to investigate the effect of the mass number and incident particle energy on the inverse reaction cross section. All the calculations were performed using MATHLAB programming language.
    Źródło:
    World Scientific News; 2016, 28; 72-83
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie neutronowej analizy aktywacyjnej NAA do identyfikacji materii pochodzenia kosmicznego na Ziemi
    Application of Neutron Activation Analysis for identification of cosmic matter on Earth
    Autorzy:
    Tymiński, Zbigniew
    Mysłek-Laurikainen, Bogumiła
    Powiązania:
    https://bibliotekanauki.pl/articles/1032679.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    NAA
    classification of meteorites
    impact craters
    meteorites
    neutron activation analysis
    neutrons
    γ spectrometry
    Opis:
    Neutron activation analysis (NAA) is an analytical method based on the measurement of characteristic radiation from radionuclides formed by neutron irradiation of the material of interest. The most suitable source of neutrons for NAA is a research reactor. The neutron activation analysis has been found to be extremely useful in the determination of trace and minor elements in geological and extraordinary samples. The method is non-destructive, giving many advantages, which are described. Measured abundances of the elements in meteorites, from major constituents down to those appearing only in trace amounts, provide information important for the theories of the origin and history of the Solar System.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 97-100
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania nad terapią BNCT w Polsce i na świecie
    Research on BNCT in Poland and in the world
    Autorzy:
    Knake, Natalia
    Maciak, Maciej
    Maliszewska-Olejniczak, Kamila
    Tymińska, Katarzyna
    Murawski, Łukasz
    Madejowski, Gaweł
    Wójciuk, Karolina
    Michaś, Edyta
    Wojtania, Grzegorz
    Kuć, Michał
    Dróżdż, Agnieszka
    Gryziński, Michał A.
    Powiązania:
    https://bibliotekanauki.pl/articles/986658.pdf
    Data publikacji:
    2019
    Wydawca:
    Indygo Zahir Media
    Tematy:
    BNCT
    hadronoterapia
    leczenie nowotworów
    związki boru
    neutrony
    hadron therapy
    cancer treatment
    boron compounds
    neutrons
    Opis:
    Przy Reaktorze MARIA w Narodowym Centrum Badań Jądrowych (NCBJ) powstaje stanowisko do badań nad terapią borowo-neutronową (BNCT). Terapia polega na napromienianiu nowotworu wiązką neutronów o odpowiednich parametrach po uprzednim podaniu pacjentowi związku boru, który w wyniku określonych mechanizmów gromadzi się głównie w komórkach rakowych. W wyniku reakcji 10B(n,α)7Li emitowane są cząstki jonizujące powodujące zniszczenie tylko tych komórek, w których zgromadzony jest bor [1]. Badania kliniczne prowadzone na świecie potwierdzają skuteczność metody, otwierając nowe perspektywy dla jej zastosowania w terapii konwencjonalnej.
    The stand for research on Boron Neutron Capture Therapy (BNCT) at the MARIA Reactor at the National Centre for Nuclear Research is being created. The therapy consists of irradiation of the tumour with a neutron beam with specific parameters after prior administration of the boron compound to the patient, which accumulates mainly in cancer cells as a result of specific mechanisms. As a result of 10B(n,α)7Li reaction, ionising particles are emitted and destroy only those cells, in which boron is accumulated. Clinical trials conducted in the world show relatively high efficiency of BNCT, opening new perspectives for its use in conventional therapy.
    Źródło:
    Inżynier i Fizyk Medyczny; 2019, 8, 4; 289-295
    2300-1410
    Pojawia się w:
    Inżynier i Fizyk Medyczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On possible formulation of problems of a Dense Plasma Focus used in material sciences
    Autorzy:
    Gribkov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/146787.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cumulative plasma streams
    dense plasma focus (DPF)
    electron beam
    ion beam
    material sciences
    neutrons
    X-rays
    Opis:
    The paper describes various possibilities at can be given by the use of dense plasma focus (DPF) device in material sciences. Main distinguishing features of such a device – availability of several different types of hard radiation and its high power flux density – determine the niche of applications of this type devices in the field. Some directions of materials investigation and treatment, which can be developed at present time, are discussed.
    Źródło:
    Nukleonika; 2000, 45, 3; 149-153
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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