Positron Lifetime Study of Reactor Pressure Vessel Steels

Čı́žek, Jakub; Procházka, I.; Kočík, J.; Keilová, E.

doi:10.1002/(sici)1521-396x(200004)178:2<651::aid-pssa651>3.3.co;2-f

Cited by 7 publications

(9 citation statements)

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“…The lifetime τ 1 of this component is (105 ± 1) and (107 ± 5) ps, for W and Fe, respectively (see Tables 1 and 2 ). These values agree well with the bulk positron lifetime for W 28 and Fe 29 . Hence, the component with lifetime τ 1 represents a contribution of free positrons de-localized in the lattice.…”

Section: Resultssupporting

confidence: 83%

Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra

Огородникова

Majerle

Čı́žek

et al. 2020

Sci Rep

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The paper presents new knowledge on primary defect formation in tungsten (W) and iron (Fe) irradiated by fission and high-energy neutrons at near-room temperature. Using a well-established method of positron-annihilation lifetime-spectroscopy (PALS), it was found that irradiation of W in the fission reactor and by high-energy neutrons from the p(35 MeV)-Be generator leads to the formation of small radiation-induced vacancy clusters with comparable mean size. In the case of Fe, smaller mean size of primary radiation-induced vacancy clusters was measured after irradiation with fission neutrons compared to irradiation with high-energy neutrons from the p(35 MeV)-Be generator. It was found that one of the reasons of the formation of the larger size of the defects with lower density in Fe is lower flux in the case of irradiation with high-energy neutrons from the p(35 MeV)-Be source. The second reason is enhanced defect agglomeration and recombination within the energetic displacement cascade at high energy primary knock-on-atoms (PKAs). This is consistent with the concept of the athermal recombination corrected (arc-dpa) model, although the measured dpa cross-section of both fission neutrons and wide-spectrum high-energy neutrons in W is between the conventional Norgett–Robinson–Torrens (NRT-dpa) and arc-dpa predictions. This means that the physics of the primary radiation effects in materials is still not fully known and requires further study through a combination of modeling and experimental efforts. The present data serve as a basis for the development of an improved concept of the displacement process.

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Section: Resultssupporting

confidence: 83%

Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra

Огородникова

Majerle

Čı́žek

et al. 2020

Sci Rep

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“…At the low-energy region (on the left to the vertical dashed lines), characterizing the Al film, the component τ 1 exceeds significantly the Al bulk lifetime of 164 ps as well as the lifetime of 243 ps for positrons trapped in Al monovacancies, 51,52 indicating positrons are trapped in open-volume defects with a size comparable to small vacancy clusters. Considering the nanocrystalline structure of B-Al and R-Al films, as described in previous sections, and the relatively short positron diffusion length compared with the mean grain size, vacancy clusters are most likely located at the grain boundaries but also partially inside the Al grains.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and physical properties of black-aluminum antireflective films

Corrêa,

More-Chevalier,

Hruška

et al. 2024

RSC Adv.

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“…Very close results for positron annihilation parameters in neutron irradiated 1.4301 (EN) stainless steel are reported in [13]. The former component corresponds to annihilation of positrons trapped at monovacancies or divacancies located on the edge dislocations [14,15]. The presence of the alloying elements in high-alloyed steel may also influence positron lifetimes.…”

Section: Resultsmentioning

confidence: 99%