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SUMMARY:XRF with SR micro beams in the study of geological samples.
DTSTART;VALUE=DATE-TIME:20160705T090000Z
DTEND;VALUE=DATE-TIME:20160705T100000Z
DTSTAMP;VALUE=DATE-TIME:20260819T044916Z
UID:indico-contribution-1202@indico.inp.nsk.su
DESCRIPTION:Speakers: Fedor Darin (Budker Institute of Nuclear Physics SB 
 RAS)\nMicro 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. Thi
 s allows us to make detailed studies of the elemental composition of vario
 us geological samples: mono crystals\, inclusions\, annual layers in the b
 ottom sediments and other. A set of analyzed elements depends on the excit
 ation 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 de
 tection 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.\nLocal microanalysis or two-dimensional scanning is possible using o
 ne focusing lens. One can make a three-dimensional study of micro inclusio
 ns by using confocal scheme of experimental station (two lenses scheme). A
 lso instrumental functions of pollycapilary lenses and confocal x-ray micr
 oscope were calculated to vary spot size on the sample (in range from 10 t
 o 100 microns) and confocal volume size.\n\nhttps://indico.inp.nsk.su/even
 t/3/contributions/1202/
LOCATION:Budker INP 2nd and 3rd floors
URL:https://indico.inp.nsk.su/event/3/contributions/1202/
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