UV Dose and Target Check
The delivered ultraviolet dose (intensity x exposure time, mW.s/cm^2 = mJ/cm^2) checked against a validated target (default 40 mJ/cm^2). A short dose points to an aged lamp, a fouled sleeve, or low UV transmittance. USEPA UV Disinfection Guidance; the validated reactor dose and the state primacy agency govern compliance.
Formula and source
dose_mj_cm2 = intensity_mw_cm2 x exposure_time_s (mW.s/cm^2 = mJ/cm^2); meets the target if dose >= target_dose (default 40 mJ/cm^2), else short.
USEPA UV Disinfection Guidance Manual (EPA 815-R-06-007) by name; dose = intensity x time, no edition cycle.
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