I.P Dolbnya

Micron spatial resolution X-ray image plates with non-erasing reading

Abstract New silverless radiophotoluminescence substances NaCl(Me) and LiF(Me) are proposed and tested as X-ray image detectors. Their spatial resolution is not worse than 2 μm and they allow one to register X-ray pictures with a dynamic range of about 5000. A stored X-ray image can be read out many times by photoluminescence measurements under UV excitation. The image can be erased completely by heating the substances up to a temperature of 400°C during 0.5 h.

Biological monitoring of meadow moths by SR-XRF technique

Abstract The study of the elemental composition of flying insect bodies is one way to obtain data about environmental conditions in certain regions and about characteristics of insect remote migrations. The results of an analysis of meadow moth bodies from different regions and populations using synchrotron radiation X-ray fluorescence analysis are presented. Comparisons with other techniques of analysis are carried out. The application of scanning X-ray fluorescence elemental analysis allows one to determine the distribution of different elements in the body of an individual moth.

Scanning synchrotron radiation X-ray fluorescence trace element analysis of microlayers of FeMn nodules; new data on ore forming processes in the Ocean

Abstract Scanning synchrotron radiation X-ray fluorescence analysis was used for studying base and trace element distributions in submarine FeMn nodules from the eastern tropical Pacific. The element background contents in surface layers of spherical (hydrogenous) and ellipsoidal (diagenetic) FeMn nodules are measured. The concentration of elements determined to be in internal layers is different from that in surface layers. This suggests changes of the environment in the past.

Combined investigation of nontraditional X-ray contrast agents for indirect lymphography

Abstract In the present study a tracer (Fe, Ag, Au) has been used on different levels of the introscopy (SR analysis, structural and fine structural studies). Routes of the tracer evacuation from the pleural cavity of a rat to the parasternal lymph nodes and the distribution of the tracers within these nodes have been studied by means of synchrotron radiation (SR), structural and fine structural analysis. It was revealed that colloidal gold labeled albumin has been localized in subcapsular sinuses, while Fe and Ag were distributed more even in the tissue of the lymph node. We conclude that colloidal gold is the most suitable contrast agent for such studies since it can be used on all levels of introscopy and transportation of various proteins coupled with gold can be demonstrated.

The experimental station for X-ray microscopy and microtomography at the VEPP-3 storage ring

Abstract The experimental station for X-ray scanning transmission microscopy and microtomography using synchrotron radiation from the VEPP-3 is described. The station allows usual and difference microroentgenographs and microtomographs to be taken in the quanta energy range 5–35 keV. At present the achievable spatial resolution is estimated to be 2–3 μm.

Focusing parabolic pyrolytic graphite X-ray monochromator

Abstract Results of the experimental testing of the focusing parabolic pyrolytic graphite X-ray monochromator on the wiggler synchrotron radiation beamline of the VEPP-3 storage ring (2 GeV, 100–150 mA) are presented. The monochromatization and the focusing of X-radiation in both vertical and horizontal directions are provided by the optical properties of the parabolic surface of revolution of the properly shaped pyrolytic graphite crystal attached to the parabolic-machined brass support. A single crystal is a half of the parabolic surface of 160 mm long and of ∼ 19 mm minimal focus length. The sagittal radii are changed from 10 to 30 mm. The available photon energy range is 7–20 keV on the first reflection harmonic. The second reflection order is still comparable with the first one in intensity: due to this fact the energy range can be extended up to 40 keV. Changing the energy of the monochromatized X-radiation is accomplished by a simple vertical shift of the monochromator.

A study of the sol-gel process of sols of hydrated oxides by SAXS using synchrotron radiation

Abstract Sols of some electrochemically produced hydrated oxides (original sols) and their mixtures (binary sols) are studied by SAXS using synchrotron radiation (SR). The presence of 1–2 nm scattering entities (primary particles) is a characteristic property of the investigated sols. During gelation and concentration of the original sols the interparticle distance varies in different ways. The binary sols gelate without concentration of the system. Particles with different sizes are observed in the binary sols. It is possible to separate two sections (time intervals) on the kinetic curves of the structural parameters concerning the changes in the binary sols.

Measurements of the absolute spectral sensitivity of X-ray semiconductor detectors in the photon energy range of 1.5–15 keV using “white” SR beam of the VEPP-3 storage ring

Abstract Results of measurements of the absolute spectral sensitivity of silicon semiconductor detectors in the X-ray quanta energy range of 1.5–15 keV are presented. The detectors, being calibrated, were placed into the direct “white” synchrotron radiation (SR) beam from the VEPP-3 storage ring. The spectrum of X-radiation at the entrance window of the detectors was changed by using sets of calibrated filters, as well as by varying the energy of the electrons in the storage ring. The possibility of accurate calculation of the SR spectrum on the calibrated detector under its irradiation in different conditions allowed us to determine the detector spectral sensitivity from a set of integral equations connecting the spectral sensitivity to the registered detector currents. The analysis of possible experimental errors indicates that the absolute spectral sensitivity of the detectors was restored with an accuracy of not worse than 10% in the total photon energy range under the study.

The statistical characteristics of element compositions of layers obtained by scanning SRXFA on ferromanganese nodule sections from Pacific Ocean

Abstract Scanning SRXF analysis was used for obtaining statistical average values, variable and correlation of element contents in layers composed FeMn ellipsoidal nodule from the tropical Pacific. Periods of diagenetic and hydrogenic nodule accretion were found out after interpretation of the contents fluctuations.

The application of the X-ray standing wave method to study NiC layered structures obtained by laser-assisted deposition

Abstract The X-ray standing wave method using fluorescence yield mode was applied to study the profile of the component-by-component distribution between Ni and C layers in Ni C layered structures produced by laser-assisted deposition. The method of recurrent relationships was used to calculate the standing wave electric field profile, and to reconstruct the Ni deep distribution. Best fitting was obtained if the intermixing thickness was equal to 3–4 A.