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| one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences |
| the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum |
scintillator scin·til·la·tor (sĭn'tl-ā'tər)
n.
A substance that glows when hit by high-energy particles or photons.