| 单词 | proportional counter |
| 释义 | > as lemmasproportional counter proportional counter n. Physics an ionization chamber in which the voltage between the electrodes is large enough to produce amplification but not so large that the output pulse ceases to be proportional to the initial ionization. ΘΚΠ the world > matter > chemistry > equipment or apparatus > [noun] > chambers for specific reactions poison tower1839 pressure chamber1857 Glover (also Glover's) tower1871 cloud chamber1897 bubble chamber1902 proportional counter1932 1932 Proc. Royal Soc. A. 137 681 The apparatus..was similar to that used by Rutherford and Chadwick except that the scintillation screen was replaced by the window of a Geiger proportional counter. 1958 R. A. Faires & B. H. Parks Radioisotope Lab. Techniques xi. 111 In order to obtain the high electric fields required to produce gas amplification, the proportional counter usually takes the form of a metal cylinder, having a fine wire, insulated at its ends, stretched along its length. 1991 Atom Jan. 8 (advt.) The Harwell designed gas flow proportional counter will detect as little as 1.5 Bq of tritium. < as lemmas |
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