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Our people-our expertise: Peter Medley

Our people-our expertise

Peter Medley

Qualifications | Research interests | Publications | Presentations | Memberships

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).


  • PhD (student) in Research School of Physics and Engineering, Australian National University, Canberra. Thesis: Environmental fate and transport of Ac-227 and Pa-231 – commenced 2015
  • Bachelor of Science (HONS 2A), Charles Darwin University, Northern Territory.
  • Bachelor of Biological Sciences, Northern Territory University, Northern Territory.

Research interests and expertise

  • Method development and applications of low-level measurement of environmental radioactivity
  • Measurement of environmental radioactivity for human health and environmental impact assessment.
  • 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.


Peter Medley
Senior Radiochemist, Radiation and Nuclear Science
phone: +61 7 3096 2903