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GDB-37和GDB-38型光电倍增管是我国目前唯一的外径为40毫米的双碱阴极材料的光电倍增管。这两种管子具有半透明K_2CsSb材料的端面窗光阴极,光阴极有效直径34毫米;光谱响应范围3000—6500埃;峰值波长4200埃左右;倍增系统分别为9个(GDB-37)和11个(GDB-38)锑碱盒栅型倍增极;外形长度为110和120毫米。耐振动、耐冲击性能好。在经过频率为50赫芝,加速度为8g,水平和垂直方向各振动半小时后,电气参数仍无明显变化。最大耐冲击加速度为20g。它们的主要性能见表
GDB-37 and GDB-38 photomultiplier tubes are currently the only photomultiplier tubes in our country with double-base cathode materials with an outer diameter of 40 mm. Both tubes have a translucent K_2CsSb end windowed photocathode with an effective cathode diameter of 34 mm; a spectral response range of 3000-6500 angstroms; a peak wavelength of about 4200 angstroms; and nine doubling systems (GDB-37) and 11 (GDB-38) Antimony Base Cascade Doubling Poles; Overall Length 110 and 120 mm. Vibration resistance, impact resistance is good. After the frequency of 50 Hertz, the acceleration of 8g, the horizontal and vertical vibration of half an hour later, the electrical parameters still no significant changes. The maximum impact acceleration of 20g. Their main properties are shown in the table