Autor: Horodek, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Monte Carlo simulation of the positron implantation profiles in the layered samples
Autorzy:: Dryzek, J.
Horodek, P.
Powiązania:: https://bibliotekanauki.pl/articles/146332.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: positron implantation
implantation profile
GEANT4 tool kit
Opis:: Theoretical studies of the positron implantation profiles in the layered samples are presented. Simulations performed using a GEANT4 tool kit revealed accumulation of positrons in denser layer embedded by less dens environment. This effect is significant for implantation profiles of slow positrons formed in a beam. Nevertheless, it is also present in conventional experiments, where positrons are emitted from radioactive nuclei. In some cases the diffusion process, which follows the implantation and thermalization processes, can smear this effect. However, defects on the interfaces or differences in the positron affinity can sustain it.
Źródło:: Nukleonika; 2010, 55, 1; 13-16
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: GEANT4 simulation of implantation profiles for positrons injected in solids from radioactive sources 22Na and 68Ge/68Ga
Autorzy:: Horodek, P.
Dryzek, J.
Powiązania:: https://bibliotekanauki.pl/articles/146334.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: positron annihilation
implantation profile
absorption coefficient
GEANT4 tool kit
Opis:: We calculated theoretically the mass absorption coefficients for positrons emitted from the commonly used sources 22Na and 68Ge/68Ga in numerous materials. For this purpose, we used the tool kit GEANT4 which allows to generate the implantation profile. An excellent agreement between the experimental profile and the calculated one was achieved. The calculated values of the mass absorption coefficients coincide well with the experimental values determined by the DSIP method.
Źródło:: Nukleonika; 2010, 55, 1; 17-19
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: The implantation profile of positrons emitted in beta plus decay of 48V in water
Autorzy:: Dryzek, J.
Horodek, P.
Dryzek, E.
Powiązania:: https://bibliotekanauki.pl/articles/148130.pdf
Data publikacji:: 2009
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: positron implantation range in water
V-48 positron emitter
Opis:: The experimental technique based on scanning of positron implantation profile, hereafter referred to as the DSIP is used for the determination of linear absorption coefficient for positrons emitted from a 48V source into water. This coefficient is equal to 1/(299š62) mi m–1. The determined value is in agreement with the one obtained from the computer simulations using the well known EGS nrc 4.0 and GEANT4 codes. The experimental technique was used for the determination of linear absorption coefficients for 48V positrons in materials of biological origin. The presented data can be useful for PET studies because of similarities of the 18F and 48V positron implantation profiles.
Źródło:: Nukleonika; 2009, 54, 4; 223-226
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Defect Range and Evolution in Swift Xe-Ion Irradiated Pure Silver Studied by Positron Annihilation Technique
Autorzy:: Dryzek, J.
Horodek, P.
Skuratov, V.
Powiązania:: https://bibliotekanauki.pl/articles/1033261.pdf
Data publikacji:: 2017-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.80.Jh
61.82.Bg
78.70.Bj
Opis:: Variable energy positron beam and positron lifetime spectroscopy were used to study pure silver samples exposed to irradiation with swift Xe²⁶⁺ ions of energy 167 MeV with different dose: of 10¹³, 5×10¹³ and 10¹⁴ ions/cm². The positron lifetime spectroscopy revealed the presence of dislocations or vacancies associated with dislocations. They are distributed at the depth of about 6 μm, and this correlates with the ion implantation range, i.e. 9 μm. However, some defects are observed also to a depth of about 18 μm. At the depth less than 1 μm from the entrance surface strong dependence of positron diffusion length on the dose is observed. It indicates the presence of interstitial atoms and/or dislocation loops as a result of Xe²⁶⁺ ions implantation.
Źródło:: Acta Physica Polonica A; 2017, 132, 5; 1585-1589
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Slow Positron Beam Studies of the Stainless Steel Surface Exposed to Sandblasting
Autorzy:: Horodek, P.
Dryzek, J.
Kobets, A.
Kulik, M.
Lokhmatov, V.
Meshkov, I.
Orlov, O.
Pavlov, V.
Rudakov, A.
Sidorin, A.
Siemek, K.
Powiązania:: https://bibliotekanauki.pl/articles/1336525.pdf
Data publikacji:: 2014-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
82.80.Yc
61.82.Bg
Opis:: The paper presents slow positron beam studies of the stainless steel grade 304 AISI samples annealed in the flow $N_2$ atmosphere and sandblasted under different pressure from 1 to 7 bar. Heating of specimens caused formation of an additional layer on the surface which can be identified as oxides. Sandblasting reduces the thickness of the oxide layer and also defects concentration (vacancies as we suppose) decreases in dependence on pressure applied during blasting. Additionally, the atomic concentrations of oxygen have been obtained using nuclear methods (Rutherford backscattering and nuclear reactions) in the near surface layers of the studied samples.
Źródło:: Acta Physica Polonica A; 2014, 125, 3; 714-717
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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