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FD-121型和FD-121G_1型能谱测井仪是对放射性钻孔中铀、钍含量进行相对测量的一种野外使用的仪器。整机包括探测部分和分析部分。探测部分由φ30×25碘化钠(铊)晶体、GDB-35型(改进型)光电倍增管和放大电路组成。这一部分安装在密封性能很好的探管内。它的输出脉冲信号经500米测井电缆传输到能谱分析部分。能谱分析部分由放大电路、两个单道分析器(即铀道和钍道)、两个五倍十进制定标器和自动定时电路组成。
The FD-121 and FD-121G_1 spectrum tools are field-based instruments for the relative measurement of uranium and thorium in radioactive bores. The whole machine includes the detection part and the analysis part. The detection part consists of φ30 × 25 crystal of sodium iodide (thallium), GDB-35 (modified) photomultiplier tube and amplifier circuit. This section is installed in a well-sealed probe. Its output pulse signal is transmitted to the EDS part through a 500 m logging cable. The energy spectrum analysis section consists of an amplifier circuit, two single-channel analyzers (uranium and thorium), two five-fold decimal scaler and automatic timing circuit.