Papers by Keyword: Radiation Stability

Abstract: The authors investigated the effect of a high-temperature modification with SiO₂ nanoparticles on the optical properties and radiation stability of BaSO₄ powders. The modification leads to insignificant alteration in the reflecting capacity within the UV, visible, and near-IR spectral regions. Appending SiO₂ nanoparticles with a concentration of up to 10 wt.% results in the increasing radiation stability of BaSO₄ powders. The maximum effect was obtained due to the decreasing intensity of the absorption bands at 270-280, 375-395, 440-460, 500-600, 700, and 950 nm at a nanoparticle concentration of 3 wt.%.

Abstract: Semiconductor Hg₃In₂Te₆ crystals and their analogous are solid solutions of In₂Te₃ and HgTe. Hg₃In₂Te₆ crystals are congruently melted as chemical compound. Like In₂Te₃ the Hg₃In₂Te₆ crystal has cubic crystal lattice with stoichiometric vacancies in their crystal structure. The electroconductivity, photoconductivity, mechanical, chemical properties of the crystals do not deteriorate after their irradiation by γ-photons with energies up to 1 MeV and doses up to 10¹⁸ cm^-2 , by electrons with energies up to 300 MeV and doses up to 10¹⁹ cm^-2 and by mixed reactor irradiation (filtered slow neutrons) with doses up to 10¹⁹ cm^-2 [1,2]. This feature is determined by high concentration (~10²¹ cm^-3) of stoihiometric vacancies (V_s) in crystal structure, where every third In-cation node is empty. These V_s are electroneutral, they capture all impurity atoms in these crystals and kept them in electroneutral state too. On the other hand this feature doesn't allow to form direct p-n junctions in these crystals by introducing the impurities. However, we have developed p-n junction analogues in form of Schottki diodes and corresponding photodiodes with semitransparent metal layer on single crystal Hg₃In₂Te₆ substrate that allows irradiation to get into active region preserving this way all the advantages compared to p-n junction.

Abstract: The influence of additives on the radiation stability of the concrete will occur through the influence of radiation changes of hardened cement paste on radiation changes of concrete and can be quite significant. The test sequence was produced according to the modified method described in case [11]. The samples were prepared in the form of prisms with the following dimensions: 10 mm x 10 mm, 30 mm. Measurement series were produced after each heating and cooling sequence. Then the difference between the values before and after heating was calculated.