Developed On Acquisition Circuit Of High Resolution γ-ray Spectrometer

Gamma-rya energy spectrad analysis has been the key technique widely usedinnuclear technologies and nuclear monitoring. A lot of radioactive measurement alldepend on this method. gamma-ray spectrum measurement play an important role inmany fileds,such as prospecting through the radioactive method、Nulear Identification、Calculating content of a elements、radioactive monitoring、PGNAA-Analysis、compton scattering imaging etc.According to different use occasions, Gamma-rayspectrometer performance and functional will be very different, In fixed places andmore different elements analysis, may use high resolution, high performance,multifunction detector. However,in mobile, portable applications, the detector is requiredEDS compact, low power consumption. Meeting this requirement,every detail ofspectrometer should be carefully designed in order to simplify the hardware andsoftware requirements.This paper presents a improved design for domestic portable field nuclideidentification instrument that has been successfully developed.This article point outemphatically analogy switch circuit replace to pole-zero can cellation circui base linerestoration circui，simplified the circuit design,improve circuit performance,reducesystem power consumption and equipment size.This paper summarizes research status and development trend of multi-channelspectrometer technology at home and abroad, discusses the whole design scheme of theacquisition system including probe、acquisition circuit and MCU software developmentplatform.γ-rayspectrometry method must be provided γ-ray spectrometryequipment basedon scientific data.Spectrometer for field measurements in the field and the practicalrequirements,combined with the spectrometer on the current market research,based onmicro-electronic technology in the development is proposed in this paperγ-ray spectrometer integration of low-power design,the LaBr₃（Ce） probe integrated with thehost console for the integration,so as to meet the measuring instrument at the scene ofnuclear small size、light weight、low power、high performance, analysis of thecharacteristics of speed requirements. γ-ray spectrometry based on the principle of thePIC24F to resource-rich single-chip microprocessor.The paper work out：1. In the performance, The use of excellent performance with30mm x30mmLaBr₃crystal, achieve higher resolution,which compared with NaI crystal.2. Analog switch replaces the previous CDD-baseline restoration circuit, whichincreased count rate by3times.3. Using active bleeder circuitreduces the voltage division circuit static powerconsumption, and accelerated, voltage level between the recovery speed afterthe pulse current.