BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Development of solid state MAS NMR techniques for the characteriza
 tion of alteration products formed during the dissolution of spent nuclear
  fuel.
DTSTART;VALUE=DATE-TIME:20171030T044500Z
DTEND;VALUE=DATE-TIME:20171030T050000Z
DTSTAMP;VALUE=DATE-TIME:20260718T062016Z
UID:indico-contribution-1170@events01.synchrotron.org.au
DESCRIPTION:Speakers: Beng Thye Tan (University of Cambridge\, Singapore N
 uclear Research and Safety Initiative)\nThe migration of radionuclides fro
 m underground nuclear waste repositories will involve the formation of ura
 nium secondary minerals when ground water reacts with the spent nuclear fu
 el. \n\nDuring oxic or anoxic spent fuel dissolution\, amorphous phases ca
 n precede the development of well-defined crystalline mineral phases.  Nuc
 lear magnetic resonance (NMR) can probe the structure of these amorphous a
 lteration products and trace the evolution of secondary phases. \n\nTo dev
 elop the technique\, potential secondary phases of $^{17}$O-enriched urani
 um minerals have been fabricated to establish the oxygen environments of b
 ecquerelite\, Ca(UO$_2$)$_6$O$_4$(OH).8(H$_2$O)\, andersonite\, Na$_2$Ca(U
 O$_2$)(CO$_3$)3.6H$_2$O and grimselite\, K$_3$Na(UO$_2$)(CO$_3$)$_3$.(H$_2
 $O). These contain calcium (Ca$^2+$)\, carbonate (CO$_3$$^{2+}$)\, and oth
 er ubiquitous ions. \nSolid state $^{17}$O MAS-NMR spectra of uranium mine
 rals have been obtained in a 9.39T magnetic field.\n\n Detailed difference
 s in oxygen local environments such as uranyl bond lengths and interlayer 
 OH and H$_2$O can be distinguished by analyzing the spectra\, which can el
 ucidate the alteration of UO$_2$ by $^{17}$O water.\n\nhttps://events01.sy
 nchrotron.org.au/event/51/contributions/1170/
LOCATION:
URL:https://events01.synchrotron.org.au/event/51/contributions/1170/
END:VEVENT
END:VCALENDAR