The Design Of Neutron ?'s Combined Detecting Electronics System On The Basis Of CLYC

In recent years,with the improvement of nuclear science and nuclear technology,the application of neutron is no longer limited in nuclear field.Instead,it is regarded as a separate discipline which is widely used in agriculture,industry,medicine,biology,environmental science,geochemistry and physical universe.It is obvious that neutron detection technology plays a vital role in daily life.Additionally,neutron has neutral characteristic which possesses strong penetrability.When it interacts with substance,it can't be ionized directly.Thus,it is difficult to detect neutron.Currently,neutron can only be detected indirectly through the secondary charged particle which is generated by its interaction with atomic nucleus.Besides,this detection not only promotes four neutron probe methods,including nuclear reaction,nuclear recoil nuclear fission and nuclear activation,but also develops BF3 proportional counter tube and 6Li glass as well as LiF/ZnS:Ag scintillator.However,those scintillators can't satisfy people's demand for neutron detection due to their limited functions.Under this circumstance,the new CLYC scintillator detector named Cs2LiYCl6:Ce(CLYC)comes into being and it owns some advantages,including higher detection efficiency,better energy resolution and higher energy resolution which is not only beneficial to achieve the simultaneous detection of neutron and ? ray,but also can replace existing ? and neutron detectors in complicated radiation environment.Therefore,this paper develops CLYC scintillator's neutron and ? detection.The followings are research results.(1)This paper introduces relative knowledge of neutron which includes the group of neutron on the basis of its energy,neutron probe method and common neutron scintillators.Besides,it also analyzes the physical property of CLYC scintillator and the detection principle of neutron-?.(2)This paper adopts CLYC scintillator detector produced by Netherlands' SCIONIX Company.According to its output signal feature and measurement requirements,this paper proposes the general technical proposal of netron-?'s combined detecting electronics system on the Basis of CLYC.(3)This paper designs hardware measurement circuit which contains impedance matching circuit,programmable gain circuit,differential driver circuit,rapid ADC data acquisition and FPGA digital signal processing circuit in order to achieve the transformation from analog signal,digital signal to spectrometry data.Furthermore,the measurement result can be concluded through spectrum data which is sent to re-development software by means of USB.(4)This paper designs the identifying algorithm of neutron-? and adopts pulse amplitude identifying algorithm to realize different identification of neutron-?.(5)On the basis of system testing and verification,this paper measures each function of circuit as well as the systemic function.This paper not only develops the design of neutron-?'s combined detecting electronics system on the basis of CLYC,but also completes hardware measurement circuit,digital signal processor and the identifying algorithm of relative neutron-?.After completing system design,this paper tests and verifies the function of each level circuit within this system.Based on relative test,the design of circuit is consistent with the requirement.What's more,this paper adopts four ? radioactive sources,including 22 Na,137Cs,60 Co,40K as well as two neutron sources,including 252 Cf and 241Am-Be to make relative experimental measurement.The result shows that the design of neutron-?'s combined detecting electronics system can meet the demand of radioactive measurement.In other words,? ray has better linearity and consistency and energy resolution is 5.17%@662ke V(137Cs).The adoption of pulse amplitude identifying method can effectively achieve the differences between neutron and ? ray.