On Tuesday 19 September 2006 08:11 pm, William Eade wrote: > Also from Wikipedia on CRT's > > The glass envelope > The outer glass allows the light generated by the phosphor out of the > monitor, but (for color tubes) it must block dangerous X-rays generated by > high energy electron beam impacting the inside of the CRT face. For this > reason, the glass is leaded (sometimes called "lead crystal"). Color tubes > require significantly higher anode voltages (as high as 32,000 volts for > large tubes) than monochrome tubes, partly to compensate for the blockage > of some electrons by the aperture mask or grille, and the amount of X-rays > produced increases with voltage. Because of leaded glass, other shielding, > and protective circuits designed to prevent the anode voltage from rising > too high in case of malfuction, the X-ray emission of modern CRTs is well > within safety limits. > > Again I ask - how many eons does it take for the lead to leach from the > glass? > > Bill Eade
Well I would also wonder how the acids often found in the decay of organic materials effect the leaching. It may take micro eons. Presumably someone, not me, may actually know. Those who want to put in some time can examine this http://tinyurl.com/n7usv which appears to be the study that started the whole brouhaha. But support for the point of view that the ban is bad may be found here: http://tinyurl.com/me33d BobLQ -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
