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Wyszukujesz frazę "γ-irradiation" wg kryterium: Wszystkie pola


Wyświetlanie 1-4 z 4
Tytuł:
Coordination Defects in Vitreous As$\text{}_{2}$S$\text{}_{3}$ Induced by γ -irradiation
Autorzy:
Shpotyuk, O.
Balitska, V.
Powiązania:
https://bibliotekanauki.pl/articles/1967921.pdf
Data publikacji:
1997-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
Destruction-polymerization transformations in vitreous As$\text{}_{2}$S$\text{}_{3}$, associated with coordination defects formation processes induced by γ-irradiation, were studied by the IR Fourier spectroscopy method in the region of 400-100 cm$\text{}^{-1}$. All topological variants of these processes, statistically possible in the investigated samples, were taken into account for physical consideration of the real structural changes.
Źródło:
Acta Physica Polonica A; 1997, 92, 3; 577-583
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comments on the Effect ofγ-Irradiation on Positronium Formation in Polymers at Low Temperatures
Autorzy:
Shantarovich, V. P.
Hirade, T.
Kevdina, I. B.
Gustov, V. W.
Oleinik, E. F.
Powiązania:
https://bibliotekanauki.pl/articles/2025760.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Quantitative description of the effect of γ-irradiation of PE and PMMA on positronium formation on the trapped electrons at low temperatures is suggested. The consideration shows that, at least in these substances, the number of the trapping centers is probably enough to localize all ortho-positronium, and therefore the intensity of the long-lived positronium component is dependent mostly on the probability of Ps formation but not on the number of the trapping centers.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 497-501
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revealing the Defects Introduced in N- or Ge-doped Cz-Si by γ Irradiation and High Temperature-High Pressure Treatment
Autorzy:
Wieteska, K.
Misiuk, A.
Prujszczyk, M.
Wierzchowski, W.
Surma, B.
Bąk-Misiuk, J.
Romanowski, P.
Shalimov, A.
Capan, I.
Yang, D.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1812256.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.c-
61.72.-y
61.82.-d
Opis:
Effect of processing under high hydrostatic pressure (= 1.1 GPa), applied at 1270 K, on Czochralski grown silicon with interstitial oxygen content $(c_O)$ up to $1.1×10^{18} cm^{-3}$, admixed with N or Ge (Si-N, c_N ≤ $1.2×10^{15} cm^{-3}$, or Si-Ge, $c_{Ge} ≈ 7×10^{17} cm^{-3}$, respectively), pre-annealed at up to 1400 K and next irradiated withγ-rays (dose, D up to 2530 Mrad, at energy E = 1.2 MeV), was investigated by high resolution X-ray diffraction, Fourier transform infrared spectroscopy, and synchrotron topography. Processing of γ-irradiated Si-N and Si-Ge under high pressure leads to stimulated precipitation of oxygen at the nucleation sites created by irradiation. It means that radiation history of Si-N and Si-Ge can be revealed by appropriate high temperature-high pressure processing.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 439-446
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Dating of Hydroxyapatite from Fossil Bones. Transient Effects after γ and UV Irradiation
Autorzy:
Wencka, M.
Hoffmann, S. K.
Hercman, H.
Powiązania:
https://bibliotekanauki.pl/articles/2043612.pdf
Data publikacji:
2005-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
65.90.+i
Opis:
ESR measurements at room temperature have been performed on fossil bones of cave bear (from Magurska Cave of the Tatra Mountains) and mammoth (from Dniestr River). Various paramagnetic centres related to defects in hydroxyapatite were identified. The ESR spectrum is dominated by Mn$\text{}^{2+}$ lines and free radical centres CO$\text{}_{2}^{-}$ and CO$\text{}_{3}^{-}$. Suitability of various EPR lines for the dating was evaluated. The spectra are affected by γ-ray and UV irradiation which produce new relatively unstable (transient) radical centres. From their decay curves we determined the delay period (waiting time) between irradiation and ESR dating measurements. For γ-rays the period is about 15 days and depends on the chosen ESR line. UV generates mainly surface O$\text{}^{-}$ centres which decay practically after a few days. The ESR dating of the bear bones using an additive dose method given the age t = 21.7 kiloyears (ky), whereas from radionuclide Th/U method t= 34 ky and from radiocarbon $\text{}^{14}$C method t > 33.1 ky.
Źródło:
Acta Physica Polonica A; 2005, 108, 2; 331-337
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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