alphatronn.

Brit.

/ˈalfətrɒn/, U.S.

/ˈælfəˌtrɑn/

Forms: also with capital initial.

Origin: Formed within English, by derivation. Etymons: alpha n., -tron suffix.

Etymology: < alpha n. + -tron suffix. In sense 1 after betatron n.; in sense 2 originally a brand name.

Physics.

1. A proposed name for: a cyclotron. rare. disused.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > particle accelerator > [noun] > types of > cyclotron

cyclotron1935

magnetic resonance accelerator1935

alphatron1942

1942 Science 23 Jan. 8/1 This distinction is emphasized in the name betatron... In the same way the name ‘alphatron’ might be given to the cyclotron because ‘alpha rays’ was the name given to the heavy particle radiation from radium.

2. An ionization gauge in which the passage of alpha particles through a near-vacuum generates an ionization current by means of which the pressure of the residual gas may be measured. Frequently attributive. Now historical.

ΘΚΠ

the world > matter > physics > atomic physics > ion > ionization > [noun] > measuring instrument

ionization gauge1918

ion gauge1938

alphatron1946

1946 Science 1 Mar. 277/2 The Alphatron Vacuum Gauge..measures pressure of any gas or mixture from 0–10 mm. of Hg.

1962 F. I. Ordway et al. Basic Astronautics v. 200 Pirani, alphatron, and bellows gauges are regularly employed in rockets.

1976 A. Roth Vacuum Technol. vi. 316 The Alphatron gauge utilizes a small source of alpha particles (e.g. a gold-radium alloy).

This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	alphatron
释义	alphatronn. Brit. /ˈalfətrɒn/, U.S. /ˈælfəˌtrɑn/ Forms: also with capital initial. Origin: Formed within English, by derivation. Etymons: alpha n., -tron suffix. Etymology: < alpha n. + -tron suffix. In sense 1 after betatron n.; in sense 2 originally a brand name. Physics. 1. A proposed name for: a cyclotron. rare. disused. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle accelerator > [noun] > types of > cyclotron cyclotron1935 magnetic resonance accelerator1935 alphatron1942 1942 Science 23 Jan. 8/1 This distinction is emphasized in the name betatron... In the same way the name ‘alphatron’ might be given to the cyclotron because ‘alpha rays’ was the name given to the heavy particle radiation from radium. 2. An ionization gauge in which the passage of alpha particles through a near-vacuum generates an ionization current by means of which the pressure of the residual gas may be measured. Frequently attributive. Now historical. ΘΚΠ the world > matter > physics > atomic physics > ion > ionization > [noun] > measuring instrument ionization gauge1918 ion gauge1938 alphatron1946 1946 Science 1 Mar. 277/2 The Alphatron Vacuum Gauge..measures pressure of any gas or mixture from 0–10 mm. of Hg. 1962 F. I. Ordway et al. Basic Astronautics v. 200 Pirani, alphatron, and bellows gauges are regularly employed in rockets. 1976 A. Roth Vacuum Technol. vi. 316 The Alphatron gauge utilizes a small source of alpha particles (e.g. a gold-radium alloy). This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021). < n.1942
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