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Photon counting head device consisting of a 28-mm(1-1/8") diameter head-on PMT, high-speed photon counting circuit, and high-voltage power supply circuit. The high voltage power supply for PMT 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 effect photosensitive area is a large as 25 mm in diameter, so the incident light can be collected very efficiently. |
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