Over 17 years of experience with techniques for low-level measurement of environmental radioactivity using radiochemistry, alpha and gamma spectrometry and liquid scintillation counting techniques. A current PhD student at the Australian National University, studying radiochemistry and Accelerator Mass Spectrometry (AMS).
Use of radioactive isotopes as tracers for environmental processes.
Medley P, Tims SG, Froehlich MB, Fifield LK, Bollhöfer A, Wallner A, Pavetich S (2019) Development of 231Pa AMS measurements to improve radiological dose assessment from uranium mining and milling. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 438:66-69. DOI: 10.1016/j.nimb.2018.07.030
Doering C, Medley P, Orr B, Urban D (2018). Tissue to whole organism conversion factors derived from an Australian tropical dataset. Journal of Environmental Radioactivity, 189: 31-39. DOI: 10.1016/j.jenvrad.2018.03.002
Doering C, Bollhöfer A, Medley P (2017). Estimating doses from Aboriginal bush foods post-remediation of a uranium mine. Journal of Environmental Radioactivity, 172: 74-80. DOI:10.1016/j.jenvrad.2017.03.014
Medley P, Doering C, Evans F., Bollhöfer A (2017). Natural radionuclides and stable elements in weaver ants (Oecophylla smaragdina) from tropical northern Australia. Journal of Environmental Radioactivity, 178-179: 404-410. DOI:10.1016/j.jenvrad.2017.05.003
Zawadzki A, Cook M, Cutmore B, Evans F, Fierro D, Gedz A, Harrison JJ, Loosz T, Medley P, Mokhber-Shahin L, Mullins S, Sdraulig S (2017). Comparison of radium-228 determination in water among Australian laboratories. Journal of Environmental Radioactivity, 178-179: 411-418. DOI:10.1016/j.jenvrad.2017.05.012
Medley P, Bollhöfer A (2016). Influence of group II metals on Radium-226 concentration ratios in the native Green Plum (Buchanania obovata) from the Alligator Rivers Region, Northern Territory, Australia. Journal of Environmental Radioactivity, 151 part 3: 551-557 DOI: 10.1016/j.jenvrad.2015.07.013
Tracy C, McWhorter T, Gienger C, Matthias Starck J, Medley P, Manolis S, Webb G, Christian K (2015). Alligators and Crocodiles Have High Paracellular Absorption of Nutrients, But Differ in Digestive Morphology and Physiology. Integrative and Comparative Biology 2015, 55(6): 986-1004 DOI: 10.1093/icb/icv060.
Medley P, Martin P, Bollhöfer A, Parry D (2014). 228Ra and 226Ra measurement on a BaSO4 co-precipitation source. Applied Radiation and Isotopes, 95: 200-207. DOI: 10.1016/j.apradiso.2014.09.015
Medley P, Bollhöfer A, Parry D, Martin P (2013). Radium concentration factors in passionfruit (Passiflora foetida) from the Alligator Rivers Region, Northern Territory, Australia. Journal of Environmental Radioactivity, 126: 137-146. DOI:10.1016/j.jenvrad.2013.07.018
Medley P, Bollhöfer A, Martin P (2013). Variability of procedural blanks leads to greater uncertainty in assessing detection limits for the measurement of polonium-210. Journal of Radioanalytical and Nuclear Chemistry, 296(2): 1155-1162. DOI: 10.1007/s10967-012-2179-y
Selected unpublished reports
Medley P, & Evans F (2018). Procedure Manual – Radiochemistry Laboratory. Internal Report 581, February, Supervising Scientist, Darwin.
Medley P (2016). Pb-210 determination using liquid scintillation counting (LSC). Internal Report 627, November, Supervising Scientist, Darwin.
Bollhöfer A, Medley P, Marshall S (2015). A summary and review of eriss’ groundwater chemistry data at Ranger uranium mine. Internal Report 631, February 2015, Supervising Scientist, Darwin.
Medley P, Pfitzner, J (2013). ROIripper – Alpha Spectrometry Software Operators Manual. Internal Report 621, November, Supervising Scientist, Darwin.
July 2019: Determining baseline radiation levels in marine biota – a comparison of SE Queensland commercial prawn species. In: SETAC-AU Conference, Darwin, Northern Territory.
November 2018: Separation of Ac using DGA resin and source preparation for alpha spectrometry via micro-precipitation without hyrdrofluoric acid. In: SPERA Conference 2018, Perth, Western Australia.
November 2018: Naturally occurring radionuclide analysis of prawns in Queensland and assessment of radiation dose [Poster], with Patterson S. In: SPERA Conference 2018, Perth, Western Australia.
November 2018: Filing in the gaps in radiological dose assessment from natural radioactivity: development of 231Pa AMS measurements with the 14UD at ANU. In: Heavy Ion Accelerator Symposium, Australian National University, Canberra.