Department / group: Accelerator mass spectrometry (AMS) Laboratory
Personal URL: Not available
Google Scholar URL: Not available

Research interests:

Accelerator micro-analysis in general and accelerator mass spectrometry (AMS) in particular.

AMS at the low-ion-energy limit, including alternative positive-ion AMS.

Cosmogenic-radionuclide environment dating.

Biomedical applications of cosmogenic or anthropogenic long-lived radionuclides.

Environmental radioactivity in general including Fukushima and Chernobyl release assessments.

Career history:

Present: Professorial Research Fellow, AMS Senior Scientist, SUERC

Active research projects:

Selected Grants

Thinning history of the Foundation-Thiel Trough Ice Stream: a key control on deglaciation of the West Antarctic Ice Sheet, Weddell Sea embayment. NERC Antarctic Funding Initiative grant. 2009-2013.

A new approach to West Antarctic Ice Sheet evolution using blue-ice moraines on nunataks. NERC standard grant. 2012-2015.

Earthquake hazard from 36Cl exposure dating of elapsed time and Coulomb stress transfer. NERC standard grant. 2012-2015.

BRITICE-CHRONO (British-Irish Ice Sheet reconstruction). NERC consortium grant. 2012-2017.

TRansfer – Exposure – Effects (TREE): Integrating the science needed to underpin radioactivity assessments for humans and wildlife. NERC RATE grant. 2013-2018.

Recent publications:

Selected Publications

S Merchel, W Bremser, V Alfimov, M Arnold, G Aumaître, L Benedetti, D L Bourlès, M Caffee, L K Fifield, R C Finkel, S P H T Freeman, M Martschini, Y Matsushi, D H Rood, K Sasa, P Steier, T Takahashi, M Tamari, S G Tims, Y Tosaki, K M Wilcken, S Xu. (2011). Ultra-trace analysis of 36Cl by accelerator mass spectrometry: an interlaboratory study. Anal. Bioanal. Chem. 400(9), 3125­-3132. doi:10.1007/s00216-011-4979-2

M J Bentley, C J Fogwill, A M Le Brocq, A L Hubbard, D E Sugden, T J Dunai, S P H T Freeman. (2010). Deglacial history of the West Antarctic Ice Sheet in the Weddell Sea embayment: constraints on past ice volume change. Geology 38, 411-414. doi:10.1130/G30754.1

S P H T Freeman, A Dougans, L McHargue, K M Wilcken, S Xu. (2008). Performance of the new single stage accelerator mass spectrometer at the SUERC. Nuclear Instruments and Methods B-266(10), 2225­-2228. doi:10.1016/j.nimb.2008.02.085

M R Kaplan, C J Fogwill, D E Sugden, N R J Hulton, P W Kubik, S P H T Freeman. (2008). Southern Patagonian glacial chronology for the Last Glacial period and implications for Southern Ocean climate. Quaternary Science Reviews 27, 284-294. doi:10.1016/j.quascirev.2007.09.013

D H Roberts, A J Long, C Schnabel, S Freeman, M J R Simpson. (2008). The deglacial history of southeast sector of the Greenland Ice Sheet during the Last Glacial Maximum. Quaternary Science Reviews 27, 1505­-1516. doi:10.1016/j.quascirev.2008.04.008