nuclear emulsion

noun Physics.
a photographic emulsion in the form of a thick block, used to record the tracks of elementary particles.

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
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nuclear emulsion

radiation detector generally in the form of a glass plate thinly coated with a transparent medium containing a silver halide compound. Passage of charged subatomic particles is recorded in the emulsion in the same way that ordinary black and white photographic film records a picture. After photographic developing, a permanent record of the paths of the charged particles remains and may be observed through a microscope. Radioactivity was discovered in 1896 by its effect on a photographic plate, and nuclear emulsions later played a pivotal role in cosmic-ray research-for example, in the discovery of the pion in 1947. Emulsions continue to be useful in the study of the production and decay of short-lived particles produced in high-energy particle physics experiments.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Each also incorporated a pair of nuclear emulsion track detectors to record the tracks of each charged particle.
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