Speaker
Mr
Fedor Darin
(Budker Institute of Nuclear Physics SB RAS)
Description
Micro beams of synchrotron radiation at the experimental station of elemental analysis in the storage ring VEPP-3 obtained using polycapillary focusing optics. The minimum sizes of the exciting radiation spot with an energy of 8 – 25 keV on the sample surface is 10x15 square microns. This allows us to make detailed studies of the elemental composition of various geological samples: mono crystals, inclusions, annual layers in the bottom sediments and other. A set of analyzed elements depends on the excitation energy. For the energy of 25 keV it is possible to analyze about 30 rock-forming and trace elements: K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag using K-series, and Ta, W, Au, Pb, Th, U using L-series. The detection limits for light elements (K, Ca) are estimated to be 500-300 ppm, for Pd, Ag in optimal conditions, the detection limit is about 50-100 ppb.
Local microanalysis or two-dimensional scanning is possible using one focusing lens. One can make a three-dimensional study of micro inclusions by using confocal scheme of experimental station (two lenses scheme). Also instrumental functions of pollycapilary lenses and confocal x-ray microscope were calculated to vary spot size on the sample (in range from 10 to 100 microns) and confocal volume size.
Primary author
Mr
Fedor Darin
(Budker Institute of Nuclear Physics SB RAS)
Co-authors
Dr
Andrey Darin
(Sobolev Institute of Geology and Mineralogy SB RAS)
Mr
Dmitry Sergeevich Sorokoletov
(Budker Institute of Nuclear Physics SB RAS)
Mr
Yakov Rakshun
(Budker Institute of Nuclear Physics SB RAS)
