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针对深孔测井要求更小体积、更高探测效率、温度特性更稳定的需求,通过LuAG(Lu_3Al_5O_(12))与NaI:Tl闪烁体的对比实验和高温型光电倍增的选择,确定了由LuAG和Hamamatsu的高温型R1288A-07光电倍增管与之组成的探头。采用温度可调节的恒温箱对探头开展20-170oC范围的温度试验,重点分析温度对LuAG探测器能量分辨率、道址和计数率的影响,为LuAG闪烁体探测器在测井中的应用提供参考。实验结果表明,(75±5)oC为LuAG探测器能量分辨率(~(137)Cs662keV)最佳温度;温度在20-70oC变化时,能量分辨率变化不超过2%;温度在70-170oC变化时,能量分辨率变化不超过7%。由此可见,LuAG探测器在高温环境中稳定性较好,可应用于测井等具有较大温度变化的环境中。但是由于温度会引起比较明显的谱漂,因此使用时需要做好稳谱工作。
In order to meet the need of smaller volume, higher detection efficiency and more stable temperature characteristics for deep hole logging, the comparison between LuAG (Lu_3Al_5O_ (12)) and NaI: Tl scintillator and the choice of high temperature type photomultiplier LuAG and Hamamatsu high-temperature type R1288A-07 photomultiplier tube with the probe. A temperature-controlled incubator is used to conduct a temperature measurement in the range of 20-170 ° C on the probe. The temperature analysis is mainly focused on the influence of temperature on the energy resolution, the address and the counting rate of the LuAG detector. The application of the LuAG scintillator detector in well logging reference. Experimental results show that (75 ± 5) oC is the optimum temperature for energy resolution of LuAG detector (~ (137) Cs662keV), and the energy resolution does not change more than 2% when the temperature changes from 20 ℃ to 70 ℃. Changes, the energy resolution does not change more than 7%. Thus, LuAG detector has good stability in high temperature environment and can be used in environments with large temperature changes such as logging. However, due to the temperature will cause a more significant spectral drift, so the need to do a stable spectrum of work.