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iris diaphragm definition

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used in fluorimeters to control the amount of radiation from the source;  consists of a series of overlapping plates arranged to move so that a roughly circular opening of variable size is produced.  This is achieved by maintaining a nearly constant angle between the edges of adjacent plates.

See also:

isotherm definition
isotope effect, steric definition
ipso-attack definition
isotopic scrambling definition
ipso-attack definition