PURPOSE: To shorten a tube length, and improve high-gain and high-speed responsiveness by providing a front stage part comprising box-type dynodes, a connection stage dynode, and a back stage part comprising inline-type dynodes.
CONSTITUTION: In a vacuum container 100, a front stage part comprising box- type dynodes 4a-4c, a connection dynode 4d, and a back stage part comprising inline-type dynodes 4e-4g are disposed to compose electron multiplier parts 4a-4h. Between the last dynode 4h and the dynode 4g, an anode electrode 5 is disposed. Aluminum coating is applied to side walls of inner surfaces of the container 100, and by giving a specified voltage to this coating, light incidental from an upper end surface 100a is photo-converted at a photoelectric surface 120, thereby generated electrons can be collected through a joint grid 40a of the dynode 4a effectively.
FUJITA YOSHIO
OISHI KEIICHI
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