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Wyszukujesz frazę "EPR dosimetry" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Application of alanine dosimetry in dose assessment for ocular melanoma patients undergoing proton radiotherapy : preliminary results
    Autorzy:
    Mierzwińska, G.
    Kłodowska, M.
    Michalec, B.
    Pędracka, A.
    Rydygier, M.
    Swakoń, J.
    Waligórski, M. P. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146382.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alanine
    EPR dosimetry
    proton beam
    proton radiotherapy
    Quality Assurance (QA)
    Opis:
    Basing on alanine solid state/electron paramagnetic resonance (EPR) dosimetry, a supplementary method of cumulatively recording the therapeutic dose received by ocular cancer patients undergoing fractionated proton radiotherapy is proposed. By applying alanine dosimetry during the delivery of consecutive fractions, the dose received within each fraction can be read out by EPR spectrometry and a fi nal permanent cumulative record of the total dose delivered obtained. The dose response of the alanine detector was found to be practically independent on its position within the extended proton Bragg peak region. Dose measurements based on entrance dose recorded in proton beams individually formed for each patient are presented. The described method will be applied as a complementary Quality Assurance procedure for patients undergoing proton radiotherapy at the Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland (IFJ PAN).
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 609-613
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study on biominerals as materials for retrospective dosimetry
    Autorzy:
    Sadło, J.
    Michalik, J.
    Stachowicz, W.
    Strzelczak, G.
    Dziedzic-Gocławska, A.
    Ostrowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146095.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dosimetry
    EPR dating
    accidental dosimetry
    hydroxyapatite
    Opis:
    Stable paramagnetic species, induced by irradiation in biominerals, can be successfully used as an EPR dosimeter in numerous domains of scientific activity. In hydroxyapatite, the main mineral component of bones, the most stable signal is assigned to CO2 - ion radical. The signal is dose dependent and allows to determine the absorbed dose in a wide range till 20 kGy, with detection limit for tooth enamel below 1 Gy. The additive dose method was applied to EPR dating of archeological objects and EPR dosimetry after accidental overexposing during radiotherapy. It was found that the age of remains excavated from the “tomb of giants” belonging to Nuraghic culture developed in Sardinia island is about 3160 years old (1160 years BC). The dose obtained by patients during the accident at the Białystok Oncological Center was evaluated at about 75 Gy. Searching for potential dosimeters among other biominerals shows that mollusc shells have very promising properties. The lowest dose detection limit was found for an Arcidae shell. Both fresh water and sea mollusc shells are useful to be used for dosimetry in the low dose range.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 95-100
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Taurine-EVA copolymer-paraffin rods dosimeters for EPR high-dose radiation dosimetr
    Autorzy:
    Maghraby, A. M.
    Mansour, A.
    Abdel-Fattah, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147366.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR
    ESR
    radiation dosimetry
    taurine
    alanine
    Opis:
    Taurine/EPR rods (3 × 10 mm) have been prepared by a simple technique in the laboratory where taurine powder was mixed with a molten mixture of paraffin wax and an ethylene vinyl acetate (EVA) copolymer. The binding mixture EVA/Paraffin does not present interference or noise in the EPR signal before or after irradiation. The rods show good mechanical properties for safe and multi-use handling. An EPR investigation of radiation induced radicals in taurine rods revealed that there are two types of radicals produced after exposure to gamma radiation (60Co). EPR spectra were recorded and analyzed – also the microwave power saturation and modulation amplitude were studied and optimized. Response of taurine to different radiation doses (1.5–100 kGy) was studied and found to follow a linear relationship up to 100 kGy. Radiation induced radicals in taurine persists and showed a noticeable stability over 94 days following irradiation. Uncertainities associated with the evaluation of radiation doses using taurine dosimeters were discussed and tabulated. It was found that taurine possesses good dosimetric properties using EPR spectroscopy in high doses in addition to its simple spectrum.
    Źródło:
    Nukleonika; 2014, 59, 1; 9-13
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study of γ-irradiated feather keratin and human fingernails concerning retrospective dose assessment
    Autorzy:
    Strzelczak, G.
    Sterniczuk, M.
    Sadło, J.
    Kowalska, M.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148231.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR spectroscopy
    keratin
    melanin
    radicals
    fingernails
    dosimetry
    Opis:
    In this paper we report the results of comparative EPR studies on free radicals generated in γ-irradiated powder samples of feather keratin powder and human fingernails. In degassed samples of both materials irradiated at 77 K the major component of EPR spectrum represents sulphur-centred radicals in cysteine residues. It quickly decays after air admission at room temperature while a singlet assigned to semiquinone melanin radicals remains the only one seen. The singlet recorded with fingernails decays slowly at room temperature and might be potentially useful for dose assessment by EPR. The advantages and limitations of fingernails EPR dosimetry are discussed.
    Źródło:
    Nukleonika; 2013, 58, 4; 505-509
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Alanine dosimetry of 60 MeV proton beam - preliminary results
    Autorzy:
    Michalec, B.
    Mierzwińska, G.
    Sowa, U.
    Ptaszkiewicz, M.
    Nowak, T.
    Swakoń, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146730.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alanine
    dosimetry
    electron paramagnetic resonance (EPR)
    proton beam
    Opis:
    Electron paramagnetic resonance (EPR) spectrometry (X-band) was used to determine the dose absorbed in alanine detectors, of different shapes and different alanine content, irradiated with Co-60 gamma rays and in a 60 MeV proton beam. The goal of our study was to confirm applicability of alanine as a passive detector in therapeutic proton beam. In the paper dose response characteristic and relative efficiency of alanine are shown. The study confirmed that alanine detectors with a high alanine content (ca. 95%) may be a useful and convenient tool for dose measurements in proton beams, used for eye cancer treatment.
    Źródło:
    Nukleonika; 2012, 57, 4; 503-506
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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