My company had the owner of Thermex Thermatron come out and do a seminar on RF. We have over 40 RF welding machines, some up to 50kw. Some of these vacuum tubes are the size of big thermos bottles. He claimed the frequency they ran at (about 14Mhz) is perfectly safe. But when he spoke on a cell phone, he held it with the tips of his fingers and used the speaker. Too much radiation.
