When There's No Cure

The use of radiometric tools to measure UV energy output "was a huge leap" when it was first applied several years ago, says Hahn. He explains that there are four bandwidths that should be considered in UV measurement—UV-A (320-390 nm), UV-B (280-320 nm), UV-C (250-260 nm), and UV-V (395-445 nm). "A typical radiometer will have a probe that will measure one particular bandwidth. If you require readings from a different bandwidth, then the instrument may require a probe change to the desired bandwidth."