A fast scintillation detector for analytical X-ray instruments
A fast scintillation detector for analytical X-ray instruments
复制标题
用于分析 X 射线仪器的快速闪烁探测器
DOI：
10.1109/23.106604
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发表时间：
1990
影响因子：
1.8
通讯作者：
J. Radtke
中科院分区：
文献类型：
--
作者：
J. Radtke
构造了一个由一个相对较快的塑料闪烁体与两个重合操作的光电倍增管耦合组成的探测器。符合门降低了随机光电倍增管暗电流脉冲的噪声。该闪烁体的形状使全内反射倾向于准直闪烁光，并表明这提高了量子效率。采用ECL（发射极耦合逻辑）门构建快速计数电子器件；这包括一个巧合门，一个单通道分析仪，和后脉冲抑制电路。系统死区时间为37 ns。当调整到观察8.1 kev x射线时，噪声脉冲速率为2.0 s/sup -1/，量子效率为86%。该噪声率明显低于其他使用有机闪烁体的报道，这是由于使用了重合门控和后脉冲抑制。>
A detector was constructed which consisted of a relatively fast plastic scintillator coupled to two photomultipliers operated in coincidence. The coincidence gate reduced noise from random photomultiplier dark current pulses. The scintillator was shaped so that total internal reflection tended to collimate scintillation light, and it was shown that this increase quantum efficiency. Fast counting electronics were built using ECL (emitter coupled logic) gates; this included a coincidence gate, a single-channel analyzer, and afterpulse rejection circuitry. System dead time was 37 ns. When adjusted to observe 8.1-keV X-rays, the noise pulse rate was 2.0 s/sup -1/ and the quantum efficiency was 86%. This noise rate was significantly lower than that reported by others using organic scintillators and was attributed to the use of coincidence gating and afterpulse rejection. >