I share this same concern. In my line of work, I am exposed to X-ray radiation while in the operating room and so my potential exposure is quite high which is why I wear a monitoring badge. Obviously, this potentially harmful exposure is of concern to me. In addition to X-rays, CT scanners output even more radiation. Ultrasounds and MRI machines do not. Nonetheless,
@paulchiu alerted me to the fact that he was noticing how some of his audio components, especially certain power supplies were emitting concerning amounts of radiation and so I went ahead and bought the same Trifield broadband meter he has, the 100XE, that measures different forms of radiation (magnetic electric, radio/microwave) and sure enough, my power supplies or equipment with large transformers are the biggest offenders. Fortunately, none of my supplies, amps, computers, DAC, speakers, headphones or CD player emit anything excessive. Regarding the High Fidelity gear, they emit almost none. Even the giant magnet sitting on my desk barely results in a blip on my meter when the meter is 1 inch away. Magnets, according to Rick, attract EMI more than they emit them.