Positron annihilation lifetime spectrometer
A technology of positron annihilation and lifetime, which is applied in the direction of material analysis using radiation, etc., can solve the problems of signal mixing into the signal stop channel and life spectrometer not working normally, and achieve fast time response, lower background, and good energy resolution Effect
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[0019] Figure 1 is a schematic diagram of the overall structure of the positron annihilation lifetime spectrometer provided by the present invention. The spectrometer includes two detectors, the start channel and the stop channel, a fast coincidence time spectrometer and a microcomputer multi-channel pulse amplitude analyzer. Each detector is formed by coupling a lanthanum chloride scintillator 1 and a photomultiplier tube 2. The power supply supplies the high voltage required by the photomultiplier tube. The fast coincidence time spectrometer includes a fast coincidence circuit, a constant ratio timing discriminator with a starting track energy window, a constant ratio timing discriminator with a stop track energy window, and a time-amplitude converter. Lanthanum chloride crystal is a new type of scintillation crystal discovered around 2000. It not only has a fast time response, but also has a better energy resolution. According to international reports, Φ25×25mm lanthanum chlori...
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