Influence Of X-ray Irradiation Research Articles

Influence of X-Ray irradiation on the formation of dielectric hysteresis loop for unipolar TGS crystals

Formation of the internal bias field Eb created in TGS crystals by X-ray emission has been studied. The sign and the value of Eb were shown to be dependent on the type of the surface (positive or negative) of unipolar sample which was irradiated by X-rays

XPS studies of nanometer CeO 2 thin films deposited by pulse ultrasonic spray pyrolysis

Cerium(IV) oxide nanometer (4.2–20 nm) thin films are deposited on Si(100) substrates by nebulization of a 0.01 M solution of cerium acetylacetonate in a 50% ethanol/water mixture followed by pyrolysis in flowing air. Influence of X-ray irradiation ( 60Co) and the proportion of pulse and interval time between pulses on the microstructure of CeO 2 films are determined by XPS. The results reveal that the film can be reduced from Ce 4+ to Ce 3+ by X-ray irradiation for about 10 h. Ce 3+ content increases with the increase of irradiation dose and there is loss of lattice oxygen greatly. Peak of lattice oxygen of O 1s increases with the decrease of the proportion, but decreases obviously with the increase of irradiation dose. Appropriate proportion is necessary for obtain pure CeO 2 nanometer thin films.

Interaction of radiation-induced defects of glasses with CdSe and CdS nanocrystals

The influence of X-ray irradiation on the absorption spectra of commercial light filters based on the glasses containing selenium, cadmium, and sulfur has been investigated. The light filters were preliminary subjected to the heat treatment, which resulted in the precipitation of nanocrystals in the glass matrix. The irradiation leads to stationary partial bleaching of glasses. Analysis demonstrates that the difference spectra contain the induced absorption bands of conventional radiation-induced color centers of alkali silicate glasses and a fine structure. The fine structure closely resembles the known difference spectra obtained under the action of the external constant or low-frequency alternating electric field on glasses containing CdSe nanocrystals. The conclusion is drawn that the stable radiation-induced centers of the glass at the interface with nanocrystals serve as a source of the Coulomb field affecting the energy levels of the size quantization of the nanocrystals. It is suggested that nanocrystals of the type of the CdSxS1−x solid solutions in these glasses are either lacking or do not manifest themselves in the spectra after irradiation.

The Influence of X-Ray Irradiation on Structural Relaxation and Crystallization of Amorphous Silicon Films

The effect of intense X-ray irradiation on the short range structure and the thermal crystallization process in sputter deposited amorphous silicon films has been examined by extended energy-loss fine structure spectroscopy and transmission electron microscopy. The coordination number and the mean square disorder of the first neighbor shell in the amorphous state were increased following X-ray irradiation. The crystallization by post-annealing was delayed, the crystallized particles were dispersed homogeneously throughout the film, and the size of the individual particles was larger than in samples without X-ray irradiation. The above facts suggest that the number of unsaturated bonds is reduced by the X-ray irradiation, which can suppress the atomic diffusion and rearrangement, necessary for the crystallization.

Influence of ionizing radiation on the conduction properties of ultra-thin silica layers

The influence of X-ray irradiation on the conduction properties and breakdown of silica layers less than 10 nm thick has been investigated. It has been found that these properties are not drastically affected, and that the X-ray irradiation induces a decrease of the defectiveness, as for much thicker layers.

Influence of X-ray irradiation of TGS and LATGS on the nucleation of ferroelectric domains with an electron beam and on the activation field

Abstract Influence of X-ray irradiation on TGS and LATGS domain structures is studied. The observation of the domains is made with the scanning electron microscope (SEM) and by the liquid crystal decoration method. With the SEM we have nucleated domains and a difference of nucleation between irradiated and non-irradiated parts of the crystal is observed. The density of the nucleated domains in the irradiated part is lower than in the non-irradiated part and the nucleation process of new domains exhibits a preferential orientation. The influence of X-ray irradiation on the activation field is presented.

Site modification of K atoms in solid Ar by X-ray and light irradiation

The influence of X-ray irradiation on the optical absorption of K-atoms in Ar-matrices was studied as a function of time and temperature. Exponential decrease of the so-called red and blue triplet absorptions was observed. Simultaneously a new absorption in the range of the red triplet was built up. The new absorption could alternatively be produced by light irradiation into the red or the blue triplet, as was shown in a second experiment studying correlated optical and ESR-absorption. After annealing at 15 K the new absorption disappeared, and the original absorptions were largely restored. All experimental results can well be understood in terms of exciton production, self-trapping, and deexcitation, and are described by a master equation system.

Isothermal Annealing of Space Charge in MNOS Structures

The influence of X-ray irradiation on the stationary conductivity and isothermal depolarization of MNOS structures is studied. It is shown that low-temperature annealing of radiated MNOS structures without bias voltage increases activation energy under isothermal depolarization from EA = 0.8 eV up to EA = 1.4 eV. The stationary conductivity activation energy is not changed and is equal to EA = 1.4 eV. [Russian Text Ignored].

On the influence of X-ray irradiation and photochemotherapy with 8-methoxypsoralen on the sebaceous gland of the Syrian hamster ear.

30 male Syrian hamsters were X-ray irradiated on 1 ear with 500 rad (Dermopan 2; setting 3; tissue half value thickness, 7.5 mm). 30 other animals were treated locally on one ear with an emulsion containing 0.15% 8-methoxypsoralen and then with UV A (10 treatments in 23 days; total UV A dose, 5.0 J/cm20. The other ear served as control. An in vivo double-labelling autoradiography with 3H- and 14C-thymidine was carried out on half of the animals of each group. The other half was administered 3H-thymidine and the number of labelled cells still in contact with the basal lamina of the sebaceous gland after 6 days was determined. The effects of X-ray irradiation and photochemotherapy are identical. Cell proliferation in the sebaceous gland was reduced, the length of the S phase was shortened, and the number of marked cells still in contact with the basal lamina after 6 days was decreased.

Location of cations in synthetic zeolites–X and –Y. Part 6.—Influence of X-ray irradiation on the location of exchangeable cations

The X-ray irradiation of a series of Ca– and La–Y zeolites, pretreated at different temperatures results in the formation of oxides (CaO and La2O3) in the sodalite cage, and in a depopulation of the hexagonal prisms. The structures are similar for all (previously different) samples and cannot be distinguished statistically. The number of oxygens in the oxides largely exceeds the level of residual water and originates from the framework. The reversible mobility of the framework oxygens is postulated, considering the zeolite framework and cations merely as a “mixed oxide”.

499. Influence of X-ray irradiation on a phase transition in CsCl thin films: R P Forier et al, Phys Stat Sol (a), 18 (2), 1973, K69–K72.

499. Influence of X-ray irradiation on a phase transition in CsCl thin films: R P Forier et al, Phys Stat Sol (a), 18 (2), 1973, K69–K72.

Influence of X-ray irradiation on a phase transition in CsCl thin films

Influence of X-ray irradiation on a phase transition in CsCl thin films

The hardening of NaCl single crystals by X-rays

The influence of X-ray irradiation and the following bleaching on microhardness and dislocation mobility was investigated. It was found that dislocations were pinned in irradiated samples and the pinning was not destroyed by illumination. The microhardness, increased by irradiation, increased still further by bleaching.

Experimental Studies on the Influence of X-Ray Irradiation on Gluthatione Content in Organs and Implanted Sarcoma fo Rabbits

Experimental Studies on the Influence of X-Ray Irradiation on Gluthatione Content in Organs and Implanted Sarcoma fo Rabbits

A contribution to the study of the thermal properties of NaCl∶Ca crystals irradiated with X-rays

In order to investigate the influence of x-ray irradiation the process of annealings, the temperature difference, DELTA T, of the irradiated and nonirradiated sodium chloride crystals was registered. Crystals with molecular contents of 0.2, 0.05, and 0.002% calcium were investigated. The x-ray imradiation was carried out at 50 kev and 30 ma through a beryllium window for 2 hr. In each of the experiments a maximum was observed on the curve showing the dependence of DELTA T on the oven temperature. With increasing calcium concentration, the position of the maximum shifted toward the lower oven temperatures.

About the Influence of X-ray Irradiation upon the Distribution of Radioactive Chromium (Cr-51) Injected into Mouse

About the Influence of X-ray Irradiation upon the Distribution of Radioactive Chromium (Cr-51) Injected into Mouse

Influence of X-Ray Irradiation on Glucose Transport in the Rat Intestine

Influence of X-Ray Irradiation on Glucose Transport in the Rat Intestine