Journal of Radiation Research and Radiation Processing ›› 2019, Vol. 37 ›› Issue (6): 48-54.doi: 10.11889/j.1000-3436.2019.rrj.37.060501

• RADIATION DOSIMETRY • Previous Articles     Next Articles

Diffusion limitation and correction of Fricke gel dosimeter in capillary tube

ZHAO Siyuan ZHANG Haiqian YUAN Tangqiang   

  1. Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • Received:2019-03-26 Revised:2019-07-24 Accepted:2019-07-24 Online:2019-12-20 Published:2019-12-23
  • Supported by:
    National Natural Science Foundation of China(11575086);a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions

Abstract:

In radiation therapy, accurate measurement of the spatial distribution of radiation dose is the key to determining the efficacy of radiation therapy. Usually, the Fricke gel dosimeters is used for the measurement of the spatial dose distribution. However, the Fe3+ diffusion problem exist in the Fricke gel dosimeter, which limits the accuracy of dosimeter measurement and leads to errors in dose verification. A capillary-type Fricke gel dosimeter is proposed to limit the diffusion of Fe3+ in two dimensions by physical and chemical limitations. Inversion derivation is used to achieve diffusion correction of Fe3+ in one dimension. Accurate calibration of the Fricke gel dosimeter was achieved by constructing a capillary-type Fricke gel dosimeter in one-dimensional direction in combination with a one-half merging image processing method. It provides a good prospect for the accurate determination of the spatial distribution of clinical radiation doses.

Key words: Fricke gel dosimeter, Diffusion correction, Dose verification, Capillary model

CLC Number: 

  • TL818