Patent ID: 7008594

Claim:
A luminescent reaction measurement device, which makes a sample gas and an oxidizing gas react in a reaction chamber and detects, by means of a light detector, the intensity of the light resulting from the chemiluminescence that occurs during said reaction, wherein inner surfaces of said reaction chamber are arranged to be light reflecting, and said reaction chamber is equipped with a light transmitting window that makes said light due to chemiluminescence in said reaction chamber be emitted therefrom towards said light detector that is installed outside said reaction chamber, said light detector is a side-on type photomultiplier tube, comprising a cylindrical container, into which emitted light due to chemiluminescence enters through a peripheral surface, a reflecting type photoelectric surface for photoelectrically converting said light due to chemiluminescence that has entered inside said container and generating photoelectrons, and plurality of dynodes, each having, on a surface at one side, a secondary electron emission surface that emits secondary electrons upon incidence of electrons and thereby successively multiplying and outputting said photoelectrons, and at least one of said dynodes receives, on a surface at a second side, said light due to chemiluminescence that has entered through said peripheral surface and reflects it toward said light transmitting window of said reaction chamber.