Gamma Spectrum Technology Research Based On LaBr₃Detector

Gamma ray spectroscopy surve measurement is a major nuclear geophysicalmethod, widely used in earth science and environmental science. The gamma rayspectroscopy surve measurement is using gamma ray spectroscopy surve in directmeasurement instrument field, according to the characteristics of gamma rayspectroscopy surve, get measuring surface of rock, soil and ore and uranium （U）,thorium （Th）, K （K） content and related species of information. With this information,we can uranium deposit prospecting, oil and gas exploration, geological mapping,looking for a range of metallic and non-metallic mineral. In addition to this, the gammaray spectroscopy surve in radioactive pollution monitoring measurement also play animportant role, application in building materials and the environment of radioactivemonitoring.The current application at home and abroad in gamma ray spectroscopy survemeasure gamma eds for more NaI （Tl） detectors and high purity ge detector, detectiontechnology tend to mature, compared with the traditional NaI （Tl） detectors and otherdetectors, LaBr₃（Ce） scintillation has better resolution and light energy efficiency, useLaBr₃（Ce） of eds gamma probe measurement of spectrum line is more careful, ofgamma spectrum analysis of a higher precision.This paper studies the content is combined with LaBr₃（Ce） detector gammaspectrum characteristics on the LaBr₃（Ce） detector detection technology research. Setup the first LaBr₃（Ce） detector gamma spectrum measurement system; Next to LaBr₃（Ce） complete gamma ray spectroscopy surve measurement system calibration andenergy scale; Finally in VC6.0language development platform completed LaBr₃（Ce）detector gamma spectrum analysis software.this paper studies the main contents of the LaBr₃（Ce） is one ofthe spectrum ofthemeasurement system including hardware construction and building software configuration. Its hardware including LaBr₃（Ce） scintillation detectors, InSpector over2000road analyzer, dc power supply, computer room and lead. Use respectivelyInSpector2000and dcpower for LaBr₃detector provides high pressure800Vand worka9V dc voltage, will LaBr₃probe of the measured data of through the cable transfer toInSpector over2000road analyzer, then the results of the analysis of multi-channelthrough a USB transfer to the computer spectrum acquisition software GENIE2000;Software configuration is in the GENIE2000spectrum acquisition analysis software inthe probe model set （including detector high voltage, and gain Settings and filter set,etc.）. Through the acquisition software GENIE2000acquisition model parametersadjustment, systemof137Cs662KeV ofthe almightypeak energyofresolution to3.5%,meet the requirements LaBr₃detector detect.Secondly, the paper also focuses on the LaBr₃（Ce） detector gamma spectrumanalysis software development. Software is inVC6.0programdevelopment platformofdevelopment, software including file management module, interface module andspectral data analysis module. The software has a good interface, can extend peace tospectrum line move operation; At the same time through the file management systemcan be read GENIE2000acquisition to spectrum line data and spectrum line shows;Lyricists; please also include data analysis module, the VC6.0and Matlab mixingprogramming technology, through the wavelet filter method completed the spectrallines smooth, smooth effect is good, but also has the energy, and found the peak, peakarea calculation and the element content analysis of the function. Softwarecomprehensive functions.In this paper, through in saturated U, Th, K standard measurement model,spectrum analysis of U, Th, K word count rate, using inverse matrix method to getLaBr₃（Ce） gamma ray spectroscopy surve instrument, the conversion coefficient andthe completion of LaBr₃（Ce） gamma ray spectroscopy surve instrument calibration;And the¹³⁷Cs and⁶⁰Co experiment combination of source measurement, complete ofgamma spectrum measurement the energy of the system calibration.