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Appendix A: Glossary of Terms

D distance (m) from the center of the UV lamp to the calibration plane of the UV meter.

E irradiance defined as the radiant power P of all wavelengths incident from all upward directions on a small element of surface containing the point under consideration divided by the area of the element. The units mW cm-2 are commonly used; 1 mW cm-2 = 10 W m-2.

L arc length (m) of the UV lamp