megavoltagen.
/ˈmɛɡəˌvəʊltɪdʒ/, /ˈmɛɡəˌvɒltɪdʒ/, U.S. /ˈmɛɡəˌvoʊltɪdʒ/ Medicine.
Voltage exceeding one million volts, spec. as used in the generation of therapeutic radiation. Chiefly attributive. Cf. orthovoltage n. at ortho- comb. form 1, supervoltage n. at super- prefix 3d(a)(iv).
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the world > health and disease > healing > medical treatment > treatment by radiation > [noun] > voltage
supervoltage1934
megavoltage1955
orthovoltage1958
1955 Nature 8 Jan. 60/1 (title) The new megavoltage radiotherapy unit in Manchester.
1961 Lancet 16 Sept. 616/2 3 patients with a recurrent infiltrating neoplasm after megavoltage therapy were included.
1968 New Eng. Jrnl. Med. 18 Apr. 895/1 If we need to deliver doses of 4000 R to the lymph nodes in many different areas, this is simply impossible to do with 250-kv conventional x-rays; it requires megavoltage energy beams.
1994 Dog World Feb. 78/2 A low-energy orthovoltage radiation therapy unit and a mega-voltage high-energy linear accelerator..will greatly enhance the ability to treat a variety of tumors.
This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022).
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