1. Department of Physics and Astronomy; University of Victoria; Victoria BC V8W 2Y2 Canada
2. Department of Physics; University of British Columbia-Okanagan Campus; Kelowna BC V1V 1V7 Canada
3. Medical Physics; BC Cancer Agency; Centre for the Southern Interior; Kelowna BC V1Y 5L3 Canada
4. Carleton Laboratory for Radiotherapy Physics; Department of Physics; Carleton University; Ottawa ON K1S 5B6 Canada
5. Department of Physics; I.K. Barber School of Arts and Sciences; University of British Columbia; Kelowna BC V1V 1V7 Canada