| 释义 |
Sievert|ˈsiːvət|
The name of R. M. Sievert, 20th-c. Swedish radiologist, used to denote either of two units of dose of ionizing radiation. †a. Sievert unit (see quot. 1955). Obs. b. (Written sievert.) (See quot. 1977.)
1945C. W. Wilson Radium Therapy iii. 70 For the practical determination of the Sievert unit dose by this method, the measurement is made..with a chamber having walls of a finite thickness. 1955Gloss. Terms Radiology (B.S.I.) 19 Sievert unit, a unit of gamma-ray dose, being the dose of radiation delivered in one hour at a distance of 1 cm from a point source of 1 mg of radium element enclosed in platinum 0·5 mm thick. It is numerically equal to about 8·4 röntgens. 1977Ann. ICRP I. iii. 4/1 The special name for the unit of dose equivalent is the sievert (Sv): 1 Sv = 1 Jkg-1 (= 100 rem). 1982Sci. Amer. Feb. 34/2 The data come from fairly high doses of radiation (·5 sievert to two sieverts). |