All light is radiation because it is simply energy moving through space. Millimeter wave is just a kind of electromagnetic wave, similar to mobile phone

communication signal, but with higher frequency and closer range, and it's non-ionizing and not enough energy to damage cells directly, so mmWave

is very safety. 

Millimeter wave radar applied to human body detection.The emitted radiation power is not higher than 10DBm, and the microwave intensity is 1/200 of

that of the mobile phone when it is close to the body, the microwave power used at normal distances is lower, and does not affect impacts to body.