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Laboratory Fellows

Mark is a NNL Laboratory Fellow specialising in actinide chemistry with over 16 years’ experience. With expertise in reprocessing chemistry, he supports the Thorp and Magnox reprocessing plants at Sellafield and provides support to the NDA on options for dealing with the UK plutonium stockpile. Mark is the NNL technical lead on a European Space Agency project that defined the AMPPEX process, used to separate americium from aged plutonium dioxide, leading to the concept design of a 241Am production facility. Mark leads work within European Union FPVII funded projects and is currently a work package leader for the Government funded Nuclear Innovation Programme on advanced reprocessing options. He delivers lecture courses on the reprocessing of nuclear fuel to IAEA and UK MoD staff and is the founder and editor of the NNL Science journal. He has strong links with the University of Manchester where he is a visiting research fellow. Mark has over 45 peer reviewed journal papers and a book chapter. He is the inaugural winner of the NNL BEST award for best journal publication on the Raman spectroscopy of plutonium dioxide.

Key publications

  • E.J. Watkinson, R.M. Ambrosi, D.P. Kramer, H.R. Williams, M.J. Reece, K. Chen, M.J. Sarsfield, C.D. Barklay, H. Fenwick, D.P. Weston , K. Stephenson, “Sintering trials of analogues of americium oxides for radioisotope power systems”, Journal of Nuclear Materials, 491, 18, (2017).
  • E.J. Watkinson, R.M. Ambrosi, H.R. Williams, M.J. Sarsfield, K. Stephenson, D.P. Weston, N. Marsh, C. Haidon, “Cerium neodymium oxide solid solution synthesis as a potential analogue for substoichiometric AmO2 for radioisotope power systems”, Journal of Nuclear Materials, 486, 308, (2017).
  • M. Carrott, C. Maher, C. Mason, M. Sarsfield, R. Taylor, "TRU-SANEX": A variation on the EURO-GANEX and i-SANEX processes for heterogeneous recycling of actinides Np-Cm. Separation Science and Technology, 51, 2198-2213, (2016).
  • M.J. Sarsfield, Ch. 13 “The co-precipitation and conversion of mixed actinide oxalates for aqueous-based reprocessing of spent nuclear fuels”, in Woodhead Publishing Series in Energy Vol 79, “Reprocessing and Recycling of Spent Nuclear Fuel”, Ed. R.J. Taylor, Woodhead Publishing, (2015).
  • M.J. Sarsfield; R.J. Taylor; C. Puxley; H.M. Steele, "Raman spectroscopy of plutonium dioxide and related materials", Journal of Nuclear Materials, 427, 333, (2012).
  • S.D. Reilly; A.J. Gaunt; B.L. Scott; G. Modolo; M. Iqbal; W. Verboom; M.J. Sarsfield, "Plutonium(IV) complexation by diglycolamide ligands-coordination chemistry insight into TODGA-based actinide separations", Chemical Communications, 9732, (2012).
  • S.M. Cornet; L.J.L. Haeller; M.J. Sarsfield; D. Collison; M. Helliwell; I. May; N. Kaltsoyannis, "Neptunium(VI) chain and neptunium(VI/V) mixed valence cluster complexes", Chemical Communications, 917, (2009).