| 单词 | point-counter |
| 释义 | > as lemmaspoint-counter point-counter n. Physics an early version of the Geiger counter in which discharges occur between positively charged chamber walls and a central, earthed, metal point. ΘΚΠ the world > matter > physics > atomic nucleus > measurement of ionizing radiation > [noun] > instrument for counting or recording counter1924 point-counter1925 tube counter1930 radiation counter1934 ratemeter1941 1925 Proc. Cambr. Philos. Soc. 22 676 The point counter has also been studied as a unit of an electrical circuit containing capacity and resistance, and an analogy established between its discharges, and the ‘flashing’ of a neon lamp. 1938 R. W. Lawson tr. G. von Hevesy & F. A. Paneth Man. Radioactivity (ed. 2) i. 18 When we are concerned with the measurement of a very small flux of radiation,..the sensitivity of the point-counter is often inadequate. 1999 Materials World July 416/2 Each particle intercepted under the crosshair is ‘measured’ and classified by means of an automatic ‘point-counter’. < as lemmas |
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