Photon counting head


The H11123 is a photon counting head device consisting of a 28 mm (1-1/8") diameter head-on photomultiplier tube, a high-speed photon counting circuit, and a high-voltage power supply circuit. The high voltage power supply for photomultiplier tube and the discrimination level are preset to optimum values, allowing photon counting measurement by just connecting a +5 V supply. The H11123 can operate at high count rate. The effective photosensitive area is as large as 25 mm in diameter, so the incident light can be collected very efficiently.


Photocathode Area Shape Round
Photocathode Area Size Dia.25 mm
Wavelength (Short) 300 nm
Wavelength (Long) 650 nm
Wavelength (Peak) 420 nm
Dimension (W x H x D) Dia. 35 x 192 mm
Input Voltage +4.75 to +5.25 V
Max. Input Voltage 6 V
Max. Input Current 70 mA
Count Senstitivity at 300 nm Typ. 1.9 x 105 s-1・pW-1
Count Senstitivity at 400 nm Typ. 4.4 x 105 s-1・pW-1
Count Senstitivity at 500 nm Typ. 3.6 x 105 s-1・pW-1
Count Senstitivity at 600 nm Typ. 1.1 x 105 s-1・pW-1
Count Linearity 5.0 x 106 s-1
Dark Count Typ. 100 s-1
Dark Count Max. 200 s-1
Pulse-pair Resolution 20 ns
Output Pulse Width 10 ns
Output Pulse Height Min. 2 V
Output Pulse Height Typ. 2.2 V
Recommended Load Resistance 50 Ω
Signal Output Logic Positive logic
Operating Ambient Temperature +5 to +40 ℃
Storage Temperature -20 to +50 ℃
Weight 260 g

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