The rapidly increasing usage of non-ionizing radiations--microwaves, ultrasound, ultra-violet, and lasers--for diagnostic and therapeutic applications demands an awareness of their energy levels, their potential hazards and safety thresholds. This paper provides comparative data on these characteristics, and areas of concern and further research are indicated.
Heinz F. Nitka,
"Energies And Hazards Of Non-Ionizing Radiations", Proc. SPIE 0233, Application of Optical Instrumentation in Medicine VIII, (18 August 1980); doi: 10.1117/12.958908; https://doi.org/10.1117/12.958908