John Ferrell wrote:
"The effects seem to be accumulative to some of us."

Perhaps. Intensity, proximity, and radiated frequency are important in
my experience.

I worked years in a shortwave broadcasting plant where about a megawatt
was being continuously radiated around the clock. No one of the many
employees ever showed any effect from the exposure.

One the other hand, my ham friend, W5OQJ, was a movie projectionist. He
contracted a chest cold. In an attempt to "bake it out", he exposed his
chest to the the ultra violet from the electric arc of the projector.
Next morning, he was dead.

Best regards, Richard Harrison, KB5WZI