Measuring radiation doses in 3-D with Polymer gel dosimeters


Australian Institute of Physics Public Lecture

Start Date

22nd Aug 2017 8:00pm

End Date

22nd Aug 2017 9:00pm


Physics Lecture Theatre 1, Sandy Bay campus

RSVP / Contact Information

E:; or T: 03 6226 7588


Presented by

Professor Clive Baldock

Pro Vice-Chancellor (Researche Development)
University of Tasmania

Polymer gel dosimeters are fabricated from radiation sensitive chemicals which, upon irradiation, polymerize as a function of the absorbed radiation dose. These gel dosimeters, with the capacity to uniquely record clinical radiotherapy (radiation therapy) radiation dose distributions in three-dimensions (3D), have specific advantages when compared to one-dimensional dosimeters, such as ion chambers, and two-dimensional dosimeters, such as film. These advantages are particularly significant in dosimetry situations where steep dose gradients exist such as in intensity modulated radiation therapy (IMRT) and stereotactic radiosurgery. Polymer gel dosimeters also have specific advantages for brachytherapy dosimetry. Potential dosimetry applications include those for low-energy x-rays, high linear energy transfer (LET) and proton therapy, radionuclide and boron capture neutron therapy dosimetries. These 3D dosimeters are radiologically soft-tissue equivalent with properties that may be modified depending on the application. The 3D radiation dose distribution in polymer gel dosimeters may be imaged using magnetic resonance imaging (MRI), optical-computerized tomography (optical-CT), x-ray CT or ultrasound. The fundamental science underpinning polymer gel dosimetry will be reviewed along with the various evaluation techniques. Clinical dosimetry applications of polymer gel dosimetry will be presented.  

After graduating from the University of Sussex in 1987 with a BSc (Hons) in Physics, Clive Baldock was subsequently employed as a medical physicist at Guy’s and St. Thomas’ Hospitals, London while studying for his MSc in Radiation Physics at St Bartholomew’s Medical College, University of London. He subsequently worked in a number of UK hospitals providing scientific support to clinical nuclear medicine and magnetic resonance imaging (MRI) services. His main research interests were in the field of gel dosimetry for improved three-dimensional radiotherapy (radiation therapy) dosimetry in cancer therapy for which he received his PhD from King's College London. He moved to Queensland University of Technology in 1997 as Lecturer and then Senior Lecturer in Medical Physics and subsequently worked at the University of Sydney from 2003 as Senior Lecturer in Physics and Director of the Institute of Medical Physics, Professor of Medical Physics from 2006 and Head of the School of Physics from 2010. In 2010, he completed a Master of Tertiary Education (Management) from the University of Melbourne. From 2012 Professor Baldock was Executive Dean of Science at Macquarie University. In 2014 he joined the University of Tasmania as Deputy Dean, and then acting Dean of the Faculty of Science, Engineering and Technology. In 2015 he joined the Australian Research Council (ARC) on a one-year secondment from UTas as Executive Director for Physical Sciences, Engineering, Mathematics and Informatics returning to UTas in 2016 as Pro Vice-Chancellor (Researcher Development) and Dean of Graduate Research. Professor Baldock’s research interests continue to be in the fields of gel dosimetry, radiation therapy, dosimetry, and medical imaging in which he has published over 160 publications in referred journals and over 200 peer reviewed conference papers. He has been awarded Fellowships of the Australian Institute of Physics, the Australasian College of Physical Scientists and Engineers in Medicine, the Institute of Physics (UK) and the Institute of Physics and Engineering in Medicine (UK).