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Measuring technology of gamma energy spectrum is the foundation of matter composition and radioactivity verifying by the way of nuclear methods. It is so widely used in fields such as geology,architecture,environment and archeology and so on. The data collecting system in apparatus of measuring nuclear energy spectrum, with the body of Multi-Channel Analyzer (MCA), involves detection technology,electron technology, and computer, and can analyze the concerned information and parameter of nuclide accurately and fleetly. With the development of embedded system,32 bit microcontroller unit has been introduced, with the representative of ARM. This improves the precision and rate of collection,and the naturalization of embedded operating system makes for the expand and integration.This paper mainly introduces the design of a new gamma spectrometer . The system consists of gamma signal processing circuit,spectrometry data acquisition circuit and application software.gamma. signal processing circuit mainly includes linear amplifier and pulse-shaped circuit.The spectrometry data acquisition circuit, which is composed of ARM S3C2410, ADC and FIFO, includes 1024-channel pulse-height analyzer. The way to store spectrom data is DMA,which is drived by s3c2410_dma.This design,based on ARM9 experimental platform provided by the shenzhen yuanfeng Information Technology Co.Ltd, migrates embedded Linux OS,QT/Embedded GUI library and YAFFS file-system , and develops the Gamma spectra software. We can not only enhance the stability of the system, but also can rapidly achieve the development of the gamma instrument and software, perform multi-task process system.This design realizes the migration of the QT/Embedded GUI library .With the Qt/Embedded development , we could rapidly develop sophisticated, visual and simply used software for gamma spectra computing and analyzing..With the microprocessor rapid computing ability, a complete set of common system peripherals, linux OS and a great of software resources based on linux, development of the gamma spectra software based on QT/Embedded GUI library, which functions include data acquisition, storage, compute and analysis,the Gamma instrument performs high-performance without computer.
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