Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (10): 100402-100402.doi: 10.11889/j.0253-3219.2019.hjs.42.100402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Development of a SiPM-based practical plastic scintillation fiber dosimeter

Cuiping YANG1,Jie XIN1,Dongdong ZHOU1,Yiqiu LI3,Lin CHAI5,Simei YOU1,Baoguo ZHANG1,2,Wanxin WEN1,2,Ming ZHANG4,Rensheng WANG1,2()   

  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
    2. The First Affiliated Hospital of Soochow University, Suzhou 215006, China
    3. Division of Ionizing Radiation, National Institute of Metrology, Beijing 100029, China
    4. Nanjing Brain Hospital, Nanjing 210029, China
  • Received:2019-07-03 Revised:2019-07-28 Online:2019-10-13 Published:2019-10-16
  • Contact: Rensheng WANG E-mail:wrs16@suda.edu;wrs16@suda.edu.cn
  • About author:YANG Cuiping, female, born in 1992, graduated from Xuzhou Medical University in 2016, master student, focusing on radiation detection in medical physics
  • Supported by:
    National Key Research and Development Project(2017YFF0206205);National Natural Science Fund Youth Fund Project(11605119);Jiangsu Natural Science Fund Youth Project(BK20160304);China Postdoctoral Science Foundation(2017M621818)

Abstract: Background

A real-time, high position resolved in-vivo dose measurement of critical health tissues and tumors is one of the most direct quality assurance (QA) tools in the radiotherapy. Plastic scintillator fiber dosimeters (PSFDs) have great advantages in dose verification due to its small size, good radiation resistance and good tissue equivalence.

Purpose

This study aims to develop a plastic scintillation fiber dosimeter (PSFD) based on silicon photomultiplier (SiPM), and investigate its performance in clinical applications.

Methods

With a stable LED pulse optical source, the leakage current of SiPM was measured by the picoammeter. Time stability and repeatability of the dosimeter, temperature response and the influence of the transmission fiber curvature on the SiPM leakage current were systematically studied. The dynamic range of the dosimeter was measured by using a small animal radiotherapy machine and LED pulse optical source.

Results

The results show that the leakage current changes <1% when the dosimeter works continuously for 8 h at constant temperature of 20 ℃, and the leakage current changes <0.5% during 32 h of intermittent operation. When the temperature change is less than 0.5 ℃, or the transmission fiber radius of curvature is greater than 11 cm, the output current change is less than 1%. The linear dynamic range of the dosimeter measurement is 100~9 000 cGy?min-1.

Conclusions

The developed dosimeter basically meets the accuracy requirements of the clinical dose verification.

Key words: Plastic scintillating fiber, SiPM, Stability, Dose response