Note the plate on the door, modified by hand to read LS-100; the original DPM-100 remains visible. The original photograph depicts the mid-1960s instrument, probably modified in the early 1970s to represent the LS model.
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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