Radiation effects in pile‐irradiated LiF crystals

Shvarts, K.K.; Vitol, A.Ya.; Podin, A.V.; Kalnin, D.O.; Ekmanis, Yu. A.

doi:10.1002/pssb.19660180242

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…Therefore, we would like to stress that it is very important to know the ionizing radiation flux in a reactor when making this type of study. The data of Davitashvjli and Politov [S] do suggest, however, that neutron damage pertnrbs tho optical absorption in KC1 crystals, and similar results have been found €or heavily irradiated LiP crystals [6].…”

Section: The Doped Specimens Contain 80 Ppm Pb Corrected Absorption mentioning

confidence: 61%

Electron and Neutron Damage in MgF₂ Crystals

Facey

Lewis

Sibley

1969

Physica Status Solidi (b)

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A comparison of electron-and neutron-radiation damage in MgF, single crystals has been made by studying changes in the optical absorption. It is found that reactor irradiation introduces many more cluster centers than does electron irradiation. Annealing studies show that above 700 OK F-centers are apparently mobile and aggregate to form M-centers. Zero phonon and phonon-assisted lines are observed a t 382.6, 384.5, 385.7, and 387.3nm and have been shown to be associated with the broad absorption band at 370 nm which is due to M-centers.Durch Untersuchung der optischen Absorption wurde in MgF,-Einkristallen ein Vergleich von Elektronen-und Neutronendamage durchgefuhrt. Es wurde gefitnden, daB eine Reaktorbestrahlung vie1 mehr Clusterzentren erzeugt als eine Elektronenbestrahlung. Temperungsuntersuchungen zeigen, daB oberhalb 700 "K F-Zentren wahrscheinlich beweglich sind und M-Zentren bilden. Null-Phononen-und phononen-assistierte Linien werden bei 382,6; 384,5; 385,7 und 387,3 nm beobachtet. Es wird gezeigt, daB sie mit breiten Absorptionsbanden bei 370 nm verbunden sind, die von ill-Zentren herriihren.

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Section: The Doped Specimens Contain 80 Ppm Pb Corrected Absorption mentioning

confidence: 61%

Electron and Neutron Damage in MgF₂ Crystals

Facey

Lewis

Sibley

1969

Physica Status Solidi (b)

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“…The lattice parameter of LiF at 20 K is a = 4.010 Å. Also, it is known [9,12,14] that irradiation of LiF at reactor temperature leads to strong radiative heating, which should cause the growth of the lattice parameter. This should be reflected in the frequency of the oscillating defect and lead to a low shifting of ν мax .…”

Section: Resultsmentioning

confidence: 99%

“…Lithium fluoride is a very convenient object to study radiation defects created in the crystal matrix by reactor irradiation. [8][9][10] The natural Li metal in LiF contains the Li 6 isotope, which has a large capture cross section for the transmutation reaction Li 6 þ n ! H 3 þ He 4 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

Akhvlediani

Dauletbekova

Baubekova

et al. 2023

Physica Status Solidi (a)

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For many solids operating under irradiation conditions, the study of their behavior at the neutron irradiation is of importance. Herein, the influence of neutron irradiation conditions on the infrared (IR) absorption spectra of LiF crystals containing different amounts of hydroxyl and metallic impurities is considered. The investigations are carried out for discovering new peculiarities under the extreme irradiation conditions of LiF—being a very important material for practical applications. In the crystals with OH− impurity after the action of neutron irradiation, quite clear bands are appeared in the region of 1900–2200 cm−1. The delivered doses vary from 1014 to 3 × 1017nnvt. LiF crystals are investigated by differing both in qualitative and quantitative contents of OH− ions. With the increase in irradiation dose, the maximum IR absorption of all investigated groups of crystals shifts to the region of low energies. The appearance of a new band in the IR spectrum and its shift as a function of dose is associated with the radiolysis of OH− molecule.

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“…Figure Useful information about the presence of defects can be derived from the absorption spectra. Unfortunately, the LiF crystals with high dose neutrons contain so many color centers that the crystal is opaque in the visible region [8]. The absorption spectra of gamma-ray-irradiated and neutron-irradiated and annealed LiF crystals are presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

Photoluminescence of Neutron-Irradiated LiF Single Crystals

Jonane¹,

Podins²,

Ivanova³

2010

Latvian Journal of Physics and Technical Sciences

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In 1980, a single LiF crystal was irradiated by thermal neutrons up to the exposition dose 10 19 n/cm 2 at the Salaspils nuclear reactor. The crystal has been kept at room temperature for 29 years. Samples in size of 5×4×1 mm 3 were cut from the crystal and some of them annealed at 920 K for 30 min. To study photoluminescence, measurements with a confocal laser scanning microscope Leica TCS SP5 were performed, during which 3D-defects of size of ~1μm 3 were revealed. Photoluminescence was observed in the red spectral region with the peak of ~ 655 nm when excited with an argon laser (λ = 458 nm).

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Radiation effects in pile‐irradiated LiF crystals

Cited by 10 publications

References 17 publications

Electron and Neutron Damage in MgF₂ Crystals

Electron and Neutron Damage in MgF₂ Crystals

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

Photoluminescence of Neutron-Irradiated LiF Single Crystals

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Radiation effects in pile‐irradiated LiF crystals

Cited by 10 publications

References 17 publications

Electron and Neutron Damage in MgF2 Crystals

Electron and Neutron Damage in MgF2 Crystals

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

Photoluminescence of Neutron-Irradiated LiF Single Crystals

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Electron and Neutron Damage in MgF₂ Crystals

Electron and Neutron Damage in MgF₂ Crystals