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Dark current is the constant response exhibited by a receptor of radiation during periods when it is not actively being irradiated. It may refer to:
- Dark current (biochemistry) : The depolarizing current, carried by Na+ ions, that flows into a photoreceptor cell when unstimulated
- Dark current (physics): The relatively small electric current that flows through a photosensitive device when no photons are entering the device
- Dark current (chemistry) : The constant response produced by a spectrochemical receptor, in the absence of radiation
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