Autor: Strzelczak, G. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: X- and Q-band EPR study on dosimetric biomaterials
Autorzy:: Strzelczak, G.
Sadło, J.
Michalik, J.
Tematy:: EPR
X- and Q-band
dosimeters
bone powder and arcidae shell
radicals; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148148.pdf Link otwiera się w nowym oknie
Opis:: Electron paramagnetic resonance (EPR) spectroscopy (X- and Q-band) was used for identification of stable radicals in: compact bone powder, shell of arcidae mollusc and crystalline alanine. The aim of our investigation was to analyze the complex EPR spectra of these materials and to identify paramagnetic species contributing to it. The most successful results were obtained in the EPR study (X- and Q-band) on deproteinized and irradiated bone powder and arcidae shell at room temperature.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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.
Tematy:: aragonite
calcite
dosimetry
EPR spectroscopy
γ-irradiation
radicals; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146101.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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.
Tematy:: EPR spectroscopy
keratin
melanin
radicals
fingernails
dosimetry; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148231.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: EPR study on biominerals as materials for retrospective dosimetry
Autorzy:: Sadło, J.
Michalik, J.
Stachowicz, W.
Strzelczak, G.
Dziedzic-Gocławska, A.
Ostrowski, K.
Tematy:: dosimetry
EPR dating
accidental dosimetry
hydroxyapatite; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146095.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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