Array of square waveguides for scintillation dosimetry in external radiotherapy

7th International Conference on 3D Radiation Dosimetry

Naseri, P.^1 ; McKenzie, D.R.^1 ; Liu, P.^1 ; Fleming, S.^1,2 ; Suchowerska, N.^1,3

School of Physics, University of Sydney, NSW 2006, Australia^1

Institute of Photonics and Optical Science, School of Physics, University of Sydney, NSW 2006, Australia^2

Department of Radiation Oncology, Royal Prince Alfred Hospital, Sydney, NSW 2050, Australia^3

关键词: Background light;    Correction factors;    External radiotherapy;    High resolution;    Light irradiances;    Scintillation signals;    Square cross section;    Square waveguide;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012061/pdf
DOI  :  10.1088/1742-6596/444/1/012061

来源: IOP

【 摘 要 】

An array of air core scintillation dosimeters (of round or square cross section) is an efficient solution for managing the problem of Cerenkov background light in megavoltage radiation. This array generates a high-resolution dose map in a way that satisfies ICRU dosimetric accuracy recommendations without the need for correction factors. Efficient scintillation signal transportation is vital to sensitivity of the dosimeter. The attenuation of the light irradiance as a function of waveguide length in PMMA and silver hollow square and round waveguides is studied experimentally and theoretically. In practice, the silvered square waveguide has the least attenuation while the PMMA square waveguide performs almost as well as commercially sourced silvered tubes. The attenuation of the commercially sourced tubes is increased by the rough internal silver surfaces.