BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Features of using of the hard X-rays ( 60 – 120 keV ) of synchro tron radiation for determination the trace concentrations of rare-earth an d heavy elements by the SRXFA method DTSTART;VALUE=DATE-TIME:20200715T113000Z DTEND;VALUE=DATE-TIME:20200715T115000Z DTSTAMP;VALUE=DATE-TIME:20260415T190403Z UID:indico-contribution-206-1798@indico.inp.nsk.su DESCRIPTION:Speakers: Aleksandr Legkodymov ()\nThe analysis of the element al composition of samples by their X-ray fluorescence spectra were perform ed at the synchrotron radiation station using radiation from the 9-pole wi ggler on VEPP-4M at the Siberian Center for Synchrotron and Terahertz Radi ation (SSTRC).\nThe excitation energy for the determination of rare-earth elements (La-Lu) and heavy platinoids (Os\,Ir\,Pt) and also Au was 60 - 12 0 keV. The Compton and the multiple scattering of radiation from samples w as analysed. The samples Russian and International standarts were used.\nT he work was done using the infrastructure of the Shared-Use Center "Siberi an Synchrotron and Terahertz Radiation Center (SSTRC)" based on VEPP-4M of BINP SB RAS (Novosibirsk\, Russian Federation\, using equipment supported by project RFMEFI62119X0022. This work is partially supported by RFBR gra nt 17-45-540618.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1798/ LOCATION:Zoom Zoom 860 5034 1820 URL:https://indico.inp.nsk.su/event/24/contributions/1798/ END:VEVENT BEGIN:VEVENT SUMMARY:Determination the pattern of spreading and accumulation of essenti al and trace elements at the benthic samples by using scanning micro-XRF-S R DTSTART;VALUE=DATE-TIME:20200715T115000Z DTEND;VALUE=DATE-TIME:20200715T121000Z DTSTAMP;VALUE=DATE-TIME:20260415T190403Z UID:indico-contribution-206-1845@indico.inp.nsk.su DESCRIPTION:Speakers: Natalya Baturina (Novosibirsk State University)\nFor river ecosystems\, one of the site of chemical elements accumulation is b enthic assemblages. In our research 20 benthic samples were collected from small rivers and streams from industrial and nature areas of Novosibirsk region. Benthic invertebrates were fixed at 75% ethanol and identified up to the family taxonomical level at the laboratory. After identification sa mples were dried up to stable weight\, animals from each taxonomical group were placed at the conductive tape for further investigation.\nThe analys is was carried out using the µXRF-SR according to the standard certified method at the experimental station "Elemental analysis" in the SCSTR (Budk er INP SB RAS). Experimental conditions: excitation energy 21 keV\, dimens ions of the exciting radiation beam 0.5 mm in height and 10 mm in width of the sample. Measuring time for one point was 100 s. The contents of more than 20 elements\, including essential Cl\, K\, Ca\, Mn\, Fe\, and trace e lements Ti\, V\, Cr\, Ni\, Cu\, Zn\, As\, Rb\, Sr\, Y\, Zr\, Nb\, Mo\, Pb were determined. The concentration range for essential elements was 150 - 10000 ppm\, for trace elements 0.3 – 1500 ppm.\nScanning was done in two directions – the length and width of the sample animal. The profile of scanning was compared with photos from the electronic microscope. That gav e us an opportunity to find out a specific locus of accumulation of some e lements. Results obtained shown patchy spreading distribution of elements in the samples\, that could be interpreted by various forms of chemical co mpounds\, which included explored elements. So\, some elements concentrati on could be determined as a part of the exoskeleton or outside contaminati on on the surface of an animal. For more complete result 3d scanning with the function of focused X-ray optics could be used.\nAll obtained data wil l be applied for the determination of the role of benthic communities' mec hanisms of essential and trace elements accumulation in river ecosystems. Moreover\, our data will be useful for the assessment of the ecological st atement of rivers and streams of industrial areas of Novosibirsk region.\n The work was carried out in the framework of the RFBR projects no. 19-05-5 0046. The work was done at the shared research center SSTRC on the basis o f the VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment supported by project RFMEFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/contrib utions/1845/ LOCATION:Zoom Zoom 860 5034 1820 URL:https://indico.inp.nsk.su/event/24/contributions/1845/ END:VEVENT BEGIN:VEVENT SUMMARY:Search for and analysis of composition and structure of submicron- size particles in geological samples DTSTART;VALUE=DATE-TIME:20200715T111000Z DTEND;VALUE=DATE-TIME:20200715T113000Z DTSTAMP;VALUE=DATE-TIME:20260415T190403Z UID:indico-contribution-206-1823@indico.inp.nsk.su DESCRIPTION:Speakers: Fedor Darin (Budker Institute of Nuclear Physics SB RAS)\nA technique combining SR XRF\, XRF mapping\, μ-XRF\, and μ-XAFS fo r search for microparticles in different matrices and determination of par ticle size\, as well as analysis of their composition and structure\, has been developed at Budker Institute of Nuclear Physics. The technique is ba sed on comprehensive examination of sample with gradually increasing the s patial resolution and constricting the study area for locating the desired microparticle. The beam size for preliminary studies ranges from 1 mm to 100 um in height and 10 mm in width. The next stage is examination using X -ray optics (polycapillary lenses) with single-lens and confocal schemes. The apparatus function of each lens is measured\, which enables controlled variation of the focal spot size from 10 um to 70 um.\nThis multifacet te chnique was tested on search for and study of micro-inclusions of light pl atinum group metals (Ru and Pd) in Bushveld (South Africa) Intrusive Compl ex samples. An area with high concentration of Pd has been found. The part icle sizes (~ 50 um) have been identified. A localized particle was studie d using the μ-XAFS method. Forms of Pd stabilization in the particle have been established\; their structural parameters (interatomic distances and coordination numbers) have been determined. \nThe work was carried out in the framework of the state assignment for IGM SB RAS and RFBR projects no . 19-05-50046\, 18-03-01251. The work was done at the shared research cent er SSTRC on the basis of the VEPP-4-VEPP-2000 complex at BINP SB RAS\, usi ng equipment supported by project RFMEFI62119X0022.\n\nhttps://indico.inp. nsk.su/event/24/contributions/1823/ LOCATION:Zoom Zoom 860 5034 1820 URL:https://indico.inp.nsk.su/event/24/contributions/1823/ END:VEVENT END:VCALENDAR