[ RadSafe ] So, in terms of health physics, what goes on in television?

[Ted de Castro]

Say what you will - BUT - the diffuse nature of a raster scan beam, that 
strikes on the mask or grid wires would be more like transmission anodes 
with considerable self attenuation and that the larger the CRT the 
greater the kV but also the thicker the glass. The problem was just NOT 
the CRT!  I know - I was there!  I measured many TV sets - it was the 
shut regulator tube in the back - ALSO - there was a considerable period 
when TVs (and data terminals) were STILL using CRTs - LARGE CRTs - and 
running the same (or higher in high resolution data color date 
terminals) kV but had solid state high voltage supplies - ie. NO shunt 
regulator tube - and it was at that point that the problem disappeared.

On 12/21/2015 6:42 PM, Hansen, Richard wrote:
> In the old style TVs with a Cathode Ray Tube (CRT), the electron beams strike the metal shadow mask or aperture grill wires, phosphors, and leaded glass. The high-speed electrons penetrating into these objects generate bremsstrahlung radiation (x rays). Current flat screen TVs do not have CRTs and do not generate x rays.
>
> NCRP Report No. 160, Ionizing Radiation Exposure of the Population of the United States, 2009
> 5.2 Television Receivers and Video Terminals
> "Television and display monitors currently utilize display technologies that no longer employ cathode-ray tube components (the source of x-ray emissions). Most of the radiation reported earlier from these sources (NCRP, 1987, Radiation Exposure of the U.S. Population from Consumer Products and Miscellaneous Sources, NCRP Report No. 95) was from [TV] receivers manufactured before the federal performance standard (FDA, 2007, "Performance standards for ionizing radiation emitting products. Television receivers," 21 CFR Part 1020.10) (originally published in 1968) was issued. X-ray emissions from receivers manufactured under the standard are essentially zero. Technologies such as liquid crystal, plasma, and other such display monitors have no potential for generating x rays."
>
> Best regards,
> Rick
>
> Rick Hansen
> Principal Scientist
> CTOS - Center for Radiological/Nuclear Training at the Nevada National Security Site
> National Security Technologies, LLC (NSTec)
> Contractor to the United States Department of Energy
> Office: 702-295-7813   Cell: 702-630-1131
> hansenrg at nv.doe.gov<mailto:hansenrg at nv.doe.gov>
> www.ctosnnsa.org
>
> The statements and opinions expressed herein are those of the author and not necessarily those of the United States Government or any agency thereof, or National Security Technologies. Reference herein to any specific commercial product, process or service does not necessarily constitute or imply its endorsement, recommendation, favoring, or a commitment to purchase. This email and any attachments may contain privacy act information. If you received this message in error or are not the intended recipient you should destroy this message and any attachments, and you are prohibited from retaining, distributing, disclosing, or using any information contained herein. Please inform us of the erroneous delivery by return e-mail. Thank you for your cooperation.
>
> _______________________________________________
> You are currently subscribed to the RadSafe mailing list
>
> Before posting a message to RadSafe be sure to have read and understood the RadSafe rules. These can be found at: http://health.phys.iit.edu/radsaferules.html
>
> For information on how to subscribe or unsubscribe and other settings visit: http://health.phys.iit.edu