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在Ge(Li)γ射线能谱仪上,连接一个NaI探测装置进行正电子湮灭辐射的多普勒加宽能谱的符合测量时,测到能谱的本底可以降低。这将有利于观察高动量电子在能谱中的贡献,并能给低能尾部谱形分析带来好处。 NaI晶体尺寸是φ40×30mm,光电倍增管型号是GBD44,主放大器是FH-430,单开端同轴型Ge(Li)探测器的灵敏体积是136cm~3,测量时,把NaI探测器与Ge(Li)探测器放在同一条轴线上,~(22)Na正电子源和样品置于二个探测器之间。NaI探测器一边的信号经单道分析器选择能量(窗在0.4～0.6MeV)作为多道分析器
In Ge (Li) gamma ray spectrometer, connected to a NaI detection device for positron annihilation radiation Doppler broadened spectrum coincidence measurement, the measured background can be reduced. This will facilitate the observation of the contribution of high-momentum electrons in the energy spectrum and will provide benefits for low-energy tail-based spectral analysis. The NaI crystal size is φ40 × 30mm, the photomultiplier tube type is GBD44, the main amplifier is FH-430, the sensitive volume of the single-opening coaxial Ge (Li) detector is 136cm ~ 3. (Li) detector on the same axis, ~ (22) Na positron source and the sample placed between the two detectors. The signal on the side of the NaI detector is selected by a single-channel analyzer (window 0.4 to 0.6 MeV) as a multi-channel analyzer