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microbeam
microbeam n. 
/ˈmaɪkrəˌbim/ a very narrowly collimated beam of radiation.
Brit. /ˈmʌɪkrə(ʊ)biːm/
, /ˈmʌɪkrə(ʊ)biːm/U.S. /ˈmaɪkroʊˌbim/
, /ˈmaɪkroʊˌbim//ˈmaɪkrəˌbim/ΘΚΠ
the world > matter > physics > atomic nucleus > radioactivity > X-rays > [noun] > narrow beam of
microbeam1950
1950 Engineering 5 May 498/3 The Cambridge work on micro~beams was most promising. It was nearing the stage when an investigator could look down a microscope, see a particle which he had etched, and direct X-rays on to that one particle.
1953 Science 8 May 493/1 A widely applicable method has been developed for high-energy irradiation of cell parts by use of proton microbeams with diameters as small as 2.5 μ.
1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) xx. 1171 If a localized microbeam is used to illuminate only a small part of the cell, only the illuminated part of the chloroplast bends.
1997 Proc. National Acad. Sci. U.S.A. 94 11578/1 Erythrocytes were destroyed by a ruby laser microbeam.
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