Just some comments for the history of the problem
The original X-Ray problem was found in some GE color tube sets that used a
triode
as a high voltage shunt regulator.
As long as the shunt was working properly there was no significant X-Ray
production and the triode was designed to contain the very low KV (soft)
X-Rays it did produce.
It was found that there was a failure mode that allowed the HV to rise and
the increased voltage was enough to generate a stronger (harder) X-Ray that
could exit the shunt tube.
As I recall the most intense area was directed down through the bottom of
the case. One of the comments about it's danger was that the most likely
person to receive significant exposure was the bar tender standing under a
wall mounted set.
I was part of a radiation safety team that inspected a GE plant in Illinois
that produced this chassie in the middle 1960s. As I recall there was no
recommendations for any changes to the production line at the plant to
reduce the exposure levels as there was not a level of radiation present
that required it.
A set was badly misadjusted for us to make some measurements that confirmed
the exposure levels.
Hugh
retired Nuke Safety Geek
----- Original Message -----
From: "Sam Goldwasser"
Newsgroups: sci.electronics.repair
Sent: Friday, June 17, 2005 7:02 AM
Subject: X-ray danger whilst working on TV?
"NSM" writes:
"James Sweet" wrote in message
news:mHqse.15960$L65.7495@trnddc05...
On a modern TV, zero risk, I've seen people *try* to make Xrays with a
TV
CRT and have very little success, there's just too much lead in the
glass.
Better to look at "The Amateur Scientist" in "Scientific American". I'm
sure
they have had a do it yourself X-Ray generator.
Typically they use an old high voltage rectifier tube. Never heard of
using a CRT.
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"Sam Goldwasser" wrote in message
...
"NSM" writes:
"James Sweet" wrote in message
news:mHqse.15960$L65.7495@trnddc05...
On a modern TV, zero risk, I've seen people *try* to make Xrays with a
TV
CRT and have very little success, there's just too much lead in the
glass.
Better to look at "The Amateur Scientist" in "Scientific American". I'm
sure
they have had a do it yourself X-Ray generator.
Typically they use an old high voltage rectifier tube. Never heard of
using a CRT.
--- sam | Sci.Electronics.Repair FAQ Mirror:
http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ:
http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites:
http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html
Note: These links are hopefully temporary until we can sort out the
excessive
traffic on Repairfaq.org.
Important: Anything sent to the email address in the message header above
is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.