Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (10): 100203-100203.doi: 10.11889/j.0253-3219.2018.hjs.41.100203

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Study on a new water equivalent liquid scintillator

WANG Junhui1, ZHANG Baoguo1,2, WEN Wanxin1,2, CHU Xuegang1, YANG Cuiping1, ZHOU Dongdong1   

  1. 1 School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123, China;
    2 Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Suzhou 215123, China
  • Received:2018-01-29 Revised:2018-05-19 Online:2018-10-10 Published:2018-10-16
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11605120), Suzhou Science and Technology Development Program (S & T Facilities) Project (No.SZS2017021)

Abstract: [Background] With the development of radiotherapy technology, new challenges have been posed for radiation dose planning techniques. Liquid scintillators have been studied a lot for dose measurement, its luminous intensity is proportional to the deposition energy, which can be used to measure the absorbed dose.[Purpose] This study aimed to develop water-equivalent liquid scintillator materials for the measurement of absorbed dose in tumor radiotherapy and radioprotection.[Methods] The liquid scintillator used in this experiment is composed of dodecylbenzene, dimethyl sulfoxide (DMSO), Triton X-100, 2,5-diphenyloxazole (PPO) and 1,4-bis-(5-phenyloxazol-2-yl)-benzene (POPOP). First, the best concentration ratio of the above materials with good water-equivalence was calculated according to the effective atomic number, electron density formula and Monte Carlo program GEANT4 (GEometry And Tracking 4). The liquid scintillator was prepared according to the optimal concentration ratio, and its water-equivalence as well as radioluminescent properties were verified using the biological X-ray irradiance and multi-channel spectrometer respectively.[Results] The results showed that the optimal component of 1 L liquid scintillator is 0.09 L of DMSO, 0.36 L of dodecylbenzene, 0.55 L of Triton-X, 4 g·L-1 of PPO and 0.2 g·L-1 of POPOP. The as-prepared liquid scintillator material has good water-equivalence (the ratio of absorbed dose to water is close to 1 with difference less than 0.1%) and retains radioluminescent property (its luminous efficiency is 1/3 of that of a typical commercial liquid scintillator).[Conclusion] This new liquid scintillator can be used as a phantom and dose detector in cancer radiotherapy and radioprotection.

Key words: Liquid scintillator, GEANT4, Dose verification, Water equivalency

CLC Number: 

  • TL99