Unidentified Beckman Instruments employees with a LS 9800 liquid scintillation counter. 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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“Completion of the First Beckman LS 9800 Liquid Scintillation Instrument,” October 1981. Beckman Historical Collection, Box 55, Folder 43. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1831cj95s.
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