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Correction Factors of Medical Electron Beams for Various Water-equivalent Materials |
YAO Jintao1,2,LI Yihua1,WANG Kun2,WANG Zhipeng2,JIN Sujun2,WU Han1,2 |
1. School of Mechanical Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract In view of the measurement and application of the correction factor for water equivalent materials in medical electron beam dose measurement, the experimental values of depth scaling factor (cpl), fluence scaling factor (hpl) and total correction factor (kpl) are obtained by scanning the percentage depth dose (PDD) curve of medical electron beam in water and water-equivalent materials. The results show that the measurement results of water equivalent materials can be converted into absorbed dose to water by the combination of cpl and hpl or only using kpl. Comparing the PDD curves shows that the maximum deviation of R50 of three water-equivalent materials after cpl-hpl correction are 0.19%, 0.28% and 0.22% compared with that measured in water at the electron energy of 10~20MeV. The maximum deviation of R50 obtained by kpl correction are 0.23%, 0.29% and 0.18%, respectively. Conclusion: the experimental data of cpl-hpl and kpl are provided, which is convenient for users to quickly measure the absorbed dose to water of electron beam, and it is simpler and more efficient to use kpl than cpl-hpl.
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Received: 09 January 2024
Published: 23 May 2024
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