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Tissue equivalency of phantom materials for neutron dosimetry in proton therapy
Faculty of Engineering - Papers (Archive)
  • Stephen Dowdell, University of Wollongong
  • Ben Clasie, Massachusetts General Hospital and Harvard Medical School, Boston, USA
  • Andrew Wroe, University of Wollongong
  • Susanna Guatelli, University of Wollongong
  • Peter E Metcalfe, University of Wollongong
  • Reinhard Schulte, Loma Linda University Medical Center, Loma Linda
  • Anatoly B. Rosenfeld, University of Wollongong
Publication Date
Publication Details

Dowdell, S, Clasie, B, Wroe, A, Guatelli, S, Metcalfe, PE, Schulte, R & Rosenfeld, A, 2009, 'Tissue equivalency of phantom materials for neutron dosimetry in proton therapy', Medical Physics, vol. 36, no. 12, pp. 5412-5419.


Purpose: Previous Monte Carlo and experimental studies involving secondary neutrons in proton therapy have employed a number of phantom materials that are designed to represent human tissue. In this study, the authors determined the suitability of common phantom materials for dosimetry of secondary neutrons, specifically for pediatric and intracranial proton therapy treatments. Methods: This was achieved through comparison of the absorbed dose and dose equivalent from neutrons generated within the phantom materials and various ICRP tissues. The phantom materials chosen for comparison were Lucite, liquid water, solid water, and A150 tissue equivalent plastic. These phantom materials were compared to brain, muscle, and adipose tissues. Results: The magnitude of the doses observed were smaller than those reported in previous experi- mental and Monte Carlo studies, which incorporated neutrons generated in the treatment head. The results show that for both neutron absorbed dose and dose equivalent, no single phantom material gives agreement with tissue within 5% at all the points considered. Solid water gave the smallest mean variation with the tissues out of field where neutrons are the primary contributor to the total dose. Conclusions: Of the phantom materials considered, solid water shows best agreement with tissues out of field.

Citation Information
Stephen Dowdell, Ben Clasie, Andrew Wroe, Susanna Guatelli, et al.. "Tissue equivalency of phantom materials for neutron dosimetry in proton therapy" (2009) p. 5412 - 5419
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