Correction for the dark count is fairly straightforward and involves the subtraction of the dark count from the signal count. Dark counts arise from thermal noise and are generated spontaneously in photomultiplier tubes. The dark count is temperature dependent and varies from tube to tube. The dark count can also change with time and is dependent on the history of light exposure. As mentioned earlier, the dark count is measured as part of a sample and is stored on all data records.
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