Development of Online Directional Dose Equivalent Rate Monitoring System

Abstract

In order to accurately measure the workplace \begin{document}$ {{\dot{H}}'\left(0.07\right) } $\end{document}in real time，the ZF-FD7 online \begin{document}$ {{\dot{H}}'\left(0.07\right) } $\end{document} monitoring system was developed. Its detector is based on plastic scintillator and SiPM，and the developed intermediate machine and upper computer have data transmission，dose rate display，over-threshold alarm and other functions. For the developed on-line \begin{document}$ {{\dot{H}}'\left(0.07\right) } $\end{document}monitoring system，the radiation characteristics measured by reference to GB/T4835.1-2012 are as follows: in the range of 76 μSv/h-1.4 Sv/h，its relative inherent error is within ±10%; The average energy of the β ray is 60-800 keV，and the response is within the range of 0.8-1.2; At −45°- 45º incidence，the response of the incidence angle is between 0.88-1.00; The repeatability of the measurement results in a 1 mSv/h radiation field is 2.0%. After temperature compensation，the response change is 0.91-1.08 within −10 ℃- 40 ℃，and 0.93-1.00 in the range of relative humidity of 45%-85%. The test results show that the characteristics of the ZF-FD7 on-line \begin{document}$ {{\dot{H}}'\left(0.07\right) } $\end{document} monitoring system meet the requirements of GB/T4835.1-2012，and can be used for real-time monitoring of directional dose equivalent rate in high weak penetrating radiation sites

Keywords

• weak penetrating radiation
• online radiation monitoring
• \begin{document}$ \dot{{h}'}\left(0.07\right) $\end{document}
• plastic scintillator
• sipm