瓦里安公司研制成一个系列的光电倍增管,倍增管的光电阴极由砷化镓构成,直径为18毫米。其面积为迄今所能获得的用Ⅲ-Ⅴ族半导体化合物制成的各种型号光电阴极面积的九倍。该结构元件的牌号为VPM—192M,与同类应用的管子比较,它的光灵敏度高两倍,峰值量子输出(最小值)翻了一番。它主要可以用来代替现有的玻璃质光电倍增管,例如分析仪器、无文或辐射测量使用的倍增 Varian developed a series of photomultiplier tubes. The cathode of the multiplier tube is made of gallium arsenide and has a diameter of 18 mm. Its area is nine times that of various types of photocathode made of group III-V semiconductor compound hitherto obtained. The structural element, the VPM-192M, has twice as much light sensitivity and twice as many peak quantum outputs (min) as the tubes of its kind. It can mainly be used to replace existing glassy photomultiplier tubes, such as analytical instruments, paperless or radiometric measurements using multiplication