pile-up 

in radioanalytical chemistry
https://doi.org/10.1351/goldbook.P04673
The processing by a radiation spectrometer of pulses resulting from the simultaneous adsorption of independent particles or photons in a radiation detector. As a result they are counted as one single particle or photon with energy between the individual energies and the sum of these energies.
Sources:
Orange Book, 2nd ed., p. 235 [Terms] [Book]
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2523 [Terms] [Paper]
Citation: 'pile-up' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04673 RIS BibTex EndNote
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Last revised: February 24, 2014