| 释义 |
photoˈmultiplier
Also with hyphen.
[f. photo- 1 + multiplier.]
Also photomultiplier tube. A phototube in which the small current from the photocathode is multiplied by a succession of secondary electrodes, so that light of very low intensity can be detected.
1940Rev. Sci. Instruments XI. 226/1 In the photo⁓multiplier the original electron current is supplied by a photo-cathode. 1955Sci. News XXXVI. 21 A photo⁓multiplier, in which an initial small pulse of light is converted into a cascade of electrons. 1961G. R. Choppin Exper. Nucl. Chem. vii. 93 Normally, in scintillation systems it is not the phosphor or photomultiplier tube that determines the resolving time, but rather it is the electronic system. 1968Brit. Med. Bull. XXIV. 261/1 Light from the spot is imaged onto the specimen.., and a photomultiplier positioned so as to read the intensity of the transmitted light. 1975D. H. Burrin in Williams & Wilson Biologist's Guide to Princ. & Techniques Pract. Biochem. v. 137 Photomultiplier tubes are more sensitive than simple photocells. 1977Dædalus Fall 42 Photo⁓multipliers convert the light pulses into electric pulses. |