Physics·Biology·Technique
Elementary properties of thermoluminescent dosimeter in dosimetry for tumor radiotherapy
Fenfen Jiang, Pei Wang, Shengwei Kang, Guohai Qi, Mingyong Xiao, Jie Li
Published 2016-05-15
Cite as Chin J Radiat Oncol, 2016, 25(5): 496-499. DOI: 10.3760/cma.j.issn.1004-4221.2016.05.016
Abstract
ObjectiveTo explore the elementary properties of LiF (Mg, Cu, and P) thermoluminescent dosimeter (TLD) in dosimetry for tumor radiotherapy, and to provide a reliable basis for thermoluminescent dosimetry in clinical radiotherapy.
Methods60Coγ-ray and 6 MV X-ray were used for evaluation of the dispersion, repeatability, and dose response of LiF TLD. To meet the requirement of clinical radiotherapy, the effects of energy, dose (50-600 cGy), radiation dose rate (50-600 MU/min), and the angle of incidence for accelerator gantry (0°-±90°) on TLD were determined and the respective correction factors were calculated.
ResultsThe errors of repeatability and dispersion of TLD were less than ±3%. There was a linear relationship between readout and irradiation dose within a certain range of irradiation dose. The minimal relative deviation of 0.3% was obtained when 6 MV X-ray was used with a dose rate of 300 MU/min and an angle of incidence of 0°.
ConclusionsLiF TLD shows excellent repeatability, low dispersion, high stability, and strong linear correlation. It meets the international criteria and can be used for dose measurement in tumor radiotherapy.
Key words:
Thermo luminescent dosimeter; Radiotherapy; Dosimetry; Fundamental characteristics; Relative deviation
Contributor Information
Fenfen Jiang
Department of Radiation Oncology, Jiangxi Maternal and Child Health Hospital, Nanchang 330006, China
Pei Wang
Department of Radiation Oncology, Sichuan Tumor Hospital, Chengdu 610041, China
Shengwei Kang
Department of Radiation Oncology, Sichuan Tumor Hospital, Chengdu 610041, China
Guohai Qi
Department of Radiation Oncology, Sichuan Tumor Hospital, Chengdu 610041, China
Mingyong Xiao
Department of Radiation Oncology, Sichuan Tumor Hospital, Chengdu 610041, China
Jie Li
Department of Radiation Oncology, Sichuan Tumor Hospital, Chengdu 610041, China