hamamatsu Photomultiplier tube R6237 76 mm x 76 mm Rectangular, Head-on type, Bialkali photocathode, Spectral response : 300 nm to 650 nm), for Gamma camera Specifications Type Special envelope type Photocathode Area Shape Square Photocathode Area Size 70 mm x 70 mm Wavelength (Short) 300 nm Wavelength (Long) 650 nm Wavelength (Peak) 420 nm Spectral Response Curve Code 400 K Photocathode Material Bialkali Window Material Borosilicate glass Dynode Structure Box-and-grid + Linear-focused Dynode Stages 8 [Max. Rating] Anode to Cathode Voltage 1500 V [Max. Rating] Average Anode Current 0.1 mA Anode to Cathode Supply Voltage 1000 V [Cathode] Luminous Sensitivity Min. 80 μA/lm [Cathode] Luminous Sensitivity Typ. 110 μA/lm [Cathode] Blue Sensitivity Index (CS 5-58) Typ. 12 [Cathode] Radiant Sensitivity Typ. 95 mA/W [Anode] Luminous Sensitivity Min. 3 A/lm [Anode] Luminous Sensitivity Typ. 30 A/lm [Anode] Radiant Sensitivity Typ. 2.6 x 104 A/W [Anode] Gain Typ. 2.7 x 105 [Anode] Dark Current (after 30min.) Typ. 2 nA [Anode] Dark Current (after 30min.) Max. 20 nA [Time Response] Rise Time Typ. 9.5 ns [Time Response] Transit Time Typ. 52 ns