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an instrument or apparatus by which numerical value is computed; in radiology, a device for enumerating ionizing events.
Coulter counter an automated instrument for performing blood counts, based on the principle that cells are poor electrical conductors compared with saline solution.
Geiger counter (Geiger-Müller counter) a radiation counter using a gas-filled tube that indicates the presence of ionizing particles. It is very sensitive to β particles but relatively insensitive to γ and x-rays.
scintillation counter a device for detecting ionization events, permitting determination of the concentration of radioisotopes in the body or other substance.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Coulter counterAn electronic device for automatic blood cell count and analysis. The demands on haematological laboratories are so great nowadays, that manual methods are impracticable and automation is essential.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Coulter counteran electronic particle analyser, in which a pair of electrodes detects the effect of a passing particle on the impedance. The counter is used to measure the total cell count in a microbiological sample.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005