I need some urgent information about how to measure UV lamp.
I am triying to measure the UV lamp efficacy and UV safety zone in certain units of our Hospital. I have already mesaured some of them. I figured out that most of them were around 50uw/cm2 at 1 m from lamp midpoint. Even new ones were not more than 100uW/cm2. It means not effective according to your suggestion. However, according to some reference "Ultraviolet Germicidal Irradiation Handbook UVGI for Air and Surface Disinfection, Wladyslaw Kowalski" says:
Page:213:The irradiance field is mostly confined to the upper zone, where levels are highest, but lower levels of UV will inevitably spread to the room below. Irradiance levels in the stratum are typically about 0.005–0.1 W/m2 (0.5–10μW/cm2) but can be higher depending on ceiling height and proximity to the lamp fixture.
Page 224: These units created a 30 cm wide upper zone and the average irradiance or fluence rate was measured with actinometers to be about 0.44 W/m2(44μW/cm2).
Q1:Did I wrong measure?