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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.
Etymology: W.H. Coulter, twentieth century American engineer
a trademark for an electric device that rapidly identifies and counts red and white blood cells present in a small specimen of human blood.
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.
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.
an instrument that counts particles in a fluid medium by electronic means. Can be calibrated to count cells in milk or a blood sample.