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background counts definition

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in particle counting, signal of particle counts that is observed during analysis of a particle-free standard test specimen. Background particle counts include electronic noise, particles contributed by the test apparatus, and signals induced by surface roughness .

See also:

azeotrope definition
Atomic Mass (Atomic Mass Average) definition
Auger-electron spectroscopy (AES) definition
automatic shutoff (ASO) definition
available equipment capacity definition