| 单词 | guard tube |
| 释义 | > as lemmasguard tube guard tube n. (a) (see quot. 1893 at sense 7b; (b) a cylindrical conductor surrounding part of a wire anode (in an ionization chamber or proportional counter) which modifies the shape of the electric field and makes the sensitive volume of the chamber more clearly defined; (c) one of a series of ionization chambers placed so as to surround a weakly radioactive source and the chambers used to detect its radiation, and connected so as to prevent radiation from other sources from being counted (see quot. 1964). ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > [noun] > measurement of > instrument for > part of guard-ring1817 guard-plate1873 guard tube1892 the world > matter > physics > atomic nucleus > radioactivity > ionizing radiation > [noun] > measuring instrument > conductor in guard tube1892 the world > matter > physics > atomic nucleus > radioactivity > ionizing radiation > [noun] > measuring instrument > protection for guard tube1892 1892 T. O'C. Sloane Standard Electr. Dict. (1893) 282 Guard Tube, a metal tube surrounding a dry pile used with a quadrant electrometer, or other electrometers of that type. 1951 Rev. Sci. Instruments 22 38/1 The best possible insulation of the collecting electrode is required, and..the use of earthed guard tubes to protect the wire is generally a necessity. 1958 H. Etherington Nucl. Engin. Handbk. v. 14 End effects will involve regions of non-uniform A and of uncertain limits of the counting volume unless ‘guard tubes’ or field-shaping features are employed. 1963 B. Fozard Instrumentation Nucl. Reactors v. 60 Counting work of this kind requires the use of anticoincidence circuits and guard tubes. 1964 R. D. Rusk Introd. Atomic & Nucl. Physics (ed. 2) xiii. 308 The surrounding ring of guard tubes is connected in anticoincidence with the counting tubes that are near the source. A cosmic ray passing through one of the counting tubes would not be counted because it would first have to pass through one of the anticoincident guard tubes. < as lemmas |
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