| 释义 |
screenage|ˈskriːnɪdʒ|
[f. screen n.1 + -age.]
The material used as a screen for ionizing radiation; such screens collectively; the action or the efficiency of screening.
1929S. Cade Radium Treatment of Cancer i. 5 The necrosis is in inverse proportion with the screenage. 1930Brit. Med. Jrnl. 8 Feb. 234 The screenage, amounting to the equivalent of just over 1 mm. of platinum, consists of monel metal, brass, aluminium, and wood. 1933Ward & Durden-Smith Recent Advances in Radium vi. 67 The screenage for seeds most commonly used at the Radium Institute is 0·5 millimetre of gold. 1940S. Cade Malignant Dis. & Treatment by Radium viii. 177 Screenage of eye applicators by substances of low or medium atomic weight, such as wax, rubber, and palladium, may..still further reduce the incidence of eye complications. 1956C. W. Wilson Radium Therapy (ed. 2) x. 239 When lead screenage is added to a radium source filtered by 0·5 mm. platinum so as completely to surround the source, the transmission curve is virtually a straight line up to 20 cm. thickness of lead. |