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UV Irradiance is the radiant power, within a stated wavelength range, arriving at a surface per. unit area, usually expressed in watts or milliwatts per square centimeter. Irradiance varies with lamp. output power, efficiency and focus of its reflector system, and distance to the surface.
It is then placed in a spectrophotometer to measure the UV absorbance at 254 nm and reported in cm1. 2.6 The SUVA calculation requires both the DOC and UVA measurement. The SUVA is calculated by dividing the UV absorbance of the sample (in cm1) by the DOC of the sample (in mg/L) and then multiplying by 100 cm/M.