Liquid scintillation counters measure the radioactivity of a sample by mixing the sample with a solvent containing a scintillator, which will emit photons in the presence of radioactive materials. The counter measures the pulses of photons as wavelengths of light detected through phototubes.
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Hesketh, Dean D. “Beckman Flow Cell and LS-230 Liquid Scintillation System,” 1970–1979. Beckman Historical Collection, Box 84. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/td96k2916.
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