Hello Everyone, Again, thanks to all who responded. I enjoyed reading the comments and getting educated on the amount of energy required to produce x-rays. My question has been fully answered and I will go ahead and experiment with 3B28 tubes on my next project. Best Regards, William
> Date: Wed, 18 Feb 2015 17:35:20 -0500 > From: [email protected] > To: [email protected] > Subject: Re: [Boatanchors] Thanks for Replies: Question: X-Rays from 3B28? > CC: [email protected]; [email protected] > > Years ago, there were 866s, which were mercury vapor type, these had a nice > blue/purple glow in operation. These had more x-ray emission than the > 3B28s, which were replacements. The 3B28s are filled with Xenon gas, > which is far less hazardous. As you have demonstrated, the low voltage > would be no hazard at all. 73s Russ. > ---- LM Picard <[email protected]> wrote: > > The soft x-rays produced by 8kv - 17kv potential differences are referred > > to as grenz rays because the occupy a place in the electro-magnetic > > spectrum between ultraviolet rays and more conventional x-rays. > > > > They lack penetrating power and may be attenuated to some extent by air and > > more efficiently by thin layers of metal. > > > > The maximum energy of x-ray photons is determined by the potential > > difference between cathode and anode. > > > > Most of the x-rays produced in a vacuum tube result from deceleration of > > electrons as they hit the target (anode). This type of radiation is called > > bremsstrahlung. Superimposed on the continuous bremsstrahlung distribution > > are “characteristic” emission lines that are specific to the composition of > > the target. > > > > The efficiency of a target in giving rise to x-ray emissions is > > proportional to the square of its atomic number. Therefore heavier metals > > are much more efficient at generating x-rays than materials lower in the > > periodic table. > > > > I have no information on the material composition of the elements in a > > 3B28. However, tubes designed for x-ray use typically have targets of > > tungsten (atomic number, 74) or molybdenum (atomic number 42). Copper has > > an atomic number of 29 and iron 26. > > > > Since x-rays are ionizing radiation, they can be detected by Geiger > > counters. > _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors
