Study Of Multipurpose Environmental Monitoring Gamma Spectrometer System

In recent years,the monitoring of radiation environment has become an issue of increasing concern for the public.This paper is supported by the National Natural Science Foundation of China:Radon mapping method based on airborne gamma spectrometry full spectrum data(work No.:41474107)and developed a multifunctional spectrometer system for environment monitoring of environment radiation monitoring,which can be used as a portable gamma ray spectrometer for mobile vehicle monitoring etc.,and can be used as a fixed automatic monitoring station for continuous monitoring,and by setting a sufficient number of detectors,the formation of the radiation monitoring network can be used.The routine environment monitoring and accident release monitoring etc..This paper develops an integrated multi-purpose environmental monitoring gamma spectrometer hardware circuit system.The hardware circuit system can communicate with the computer which is equipped with the gamma spectrometer software through the TCP/IP network communication and the wireless LoRa communication in two ways.Using TCP/IP network communication,a set of portable multichannel gamma spectrometer system which is applied to mobile measurement of vehicle and other environment radiation monitoring is made up.Using LoRa wireless communication,the detector hardware circuit system can be placed in a fixed monitoring station,and a number of detector hardware circuit systems can be placed in a number of fixed monitoring stations.That is,a tablet computer can operate a number of detector hardware circuits and form a monitoring network for radiation environment.So the operator can control the measurement of the instrument remotely,the operator can avoid the possible radionuclide radiation while obtaining the real-time spectral data.If the radiation anomaly occurs,the operator can be quickly fed back to the remote operator.In the research and development of the gamma spectrometry software based on the Android system,we studied the algorithms of nuclide identification,smoothing,energy scaling and efficiency calibration.A new nuclide recognition algorithm based on singular value method is designed and implemented in China for the first time,which avoids the problem of missing and misreporting the nuclide of the traditional energy comparison method.The efficient split base algorithm takes fast Fourier transform and fast Fourier inverse transform to carry out the spectral line smoothing,and doubles the speed of the traditional Fourier transform.The polynomial energy scale of the matrix is compared with the general linear algebraic solution of the Gauss elimination method,and the speed and precision of the operation are improved.Solution of Vandermonde equations by matrix inversion algorithm to further simplify the solving efficiency calibration,operation.The experimental test shows that the distance of LoRa wireless communication can reach 8km at the farthest distance;the time of the nuclide recognition of the gamma ray spectrum software is short,and the resolution of the spectrum is fast and the result is accurate with the use of smooth and energy scale.The energy resolution is up to 6.9%,and the energy linearity and stability of its important index are compared with the foreign products.The result confirms that the energy linearity and stability are compared with other products.The performance of foreign advanced commercial portable gamma spectrometer has been achieved.