screenagen.
/ˈskriːnɪdʒ/, U.S. /ˈskrinᵻdʒ/ Now rare.
1. Protection from view provided by trees, hedges, etc. Also as a count noun: something that provides protection from view.
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1834 J. Galt Lit. Life & Misc. II. 180 The high mountains were only a screenage to the land from the sea.
1863 Horticulturalist & Jrnl. Rural Art & Rural Taste Aug. 259/2 I shall esteem it a favor if you give me some instruction as to how I can best..procure the desired screenage and protection.
1897 I. N. Morris With Trade-winds 69 Hid by the screenage of rich palms and exotics..the first officer of the Solent and I decided to spend the day in an outing.
2012 telegraph.co.uk (Nexis) 3 Sept. These [sc. structures] will be below the treeline due to natural screenage.
2. Material used as a screen against ionizing radiation, esp. during radiotherapy; the efficiency of this, as determined by its nature and thickness. Also: the action of using such a screen.
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the world > health and disease > healing > medical treatment > treatment by radiation > [noun] > by X-rays > filter or screen
screenage1916
filter2006
the world > matter > physics > atomic nucleus > radioactivity > ionizing radiation > [noun] > protective material
screenage1916
1916 Radium 6 88 When we work on such tissues as the lung, the neck or other deep parts of the body, we must increase the dosage and screenage.
1918 Urol. & Cutaneous Rev. Mar. 174/2 The radium has been contained in a capsule of platinum 1.5 mm. in thickness, a screenage sufficient to filter out practically all of the irritating beta rays.
1929 S. Cade Radium Treatm. Cancer i. 5 The necrosis is in inverse proportion with the screenage.
1930 Brit. 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.
1933 W. R. Ward & A. J. Durden Smith Recent Adv. in Radium vi. 67 The screenage for seeds most commonly used at the Radium Institute is 0·5 millimetre of gold.
1940 S. Cade Malignant Dis. & Treatm. 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.
1956 C. 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.
This entry has been updated (OED Third Edition, March 2017; most recently modified version published online March 2022).
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