Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1885914 | Radiation Physics and Chemistry | 2016 | 5 Pages |
Abstract
Real-time dosimetry plays an important role for accurate patient-dose measurement during radiotherapy. A tiny piece of laboratory fabricated Ge-doped optical fiber has been investigated as a radioluminescence (RL) sensor for real-time dosimetry over the dose range from 1Â Gy to 8Â Gy under 6Â MV photon beam by LINAC. Fiber-coupled software-based RL prototype system was used to assess essential dosimetric characteristics including dose response linearity, dose rate dependency, sensitivity, repeatability and output dependence on field sizes. The consistency level of RL photon counts versus dose rate was also compared with that of standard Al2O3:C chips. Sensitivity of Ge-doped fiber were found to be sufficiently sensitive for practical use and also provided linear dose responses for various dose rates from 100Â cGy/min to 600Â cGy/min using both 6Â MV photon and 6Â MeV electron beams. SEM-EDX analysis was performed to identify Ge-dopant concentration level within the optical fiber RL material. Accumulated doses were also estimated using simple integral technique and the error was found to be around less than 1% under dissimilar dose rates or repeat measurements. The evaluation of the Ge-doped optical fiber based RL dosimeter system indicates its potential in medical dosimetry.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
A.K.M. Mizanur Rahman, H.T. Zubair, Mahfuza Begum, H.A. Abdul-Rashid, Z. Yusoff, Nasr Y.M. Omar, N.M. Ung, K.A. Mat-Sharif, D.A. Bradley,