Original poster: David Speck <dave@xxxxxxxxxxxxxxxx> Joe,The objection to the use of thoriated gap elements is that thorium is a naturally radioactive alpha particle emitter. There is a small but measurable amount of gap erosion during TC operation, with some of that electrode material being converted to fine airborne radioactive dust. I think that many coilers are willing to sacrifice a small amount of gap efficiency to reduce the risk of lung cancer.
Dave Tesla list wrote:
Original poster: "Joe Smith" <proffessor@xxxxxxxxxxx> Hello Group: In reference to a rotary spark gap,,10 electrodes 1/2" X 1 and 1/2" ,high speed,for a large coil,16X80 secondary. Thoriated is used for welding rods for a quicker spark,,,,,, thats all I know of the difference. What is the preference for Tesla coils? Thanks Joe