M
Michael C
- Jan 1, 1970
- 0
Simple question. Will xrays damage electronics? Say if I was to xray the
circuit in my car key?
Thanks,
Mike
circuit in my car key?
Thanks,
Mike
Simple question.
Will xrays damage electronics?
Simple question. Will xrays damage electronics? Say if I was to xray the
circuit in my car key?
One interesting thing is that some OTP eproms can be erased with low level
X-rays over a long enough period and in the presence of a small bias
voltage,
I have heard of a case where a b/w monitor had its scan arranged for a
spot
size, the EHT turned up so X-rays were produce from a region of the centre
of
the screen, this was hten used to erase or rather upset some cells on an
otp eprom so it could have part of its code written with a hack to dump
whatever code was left. This would take a huge amount of time, especially
as the erasing would be pretty random but I have also heard that some
security cells in the early days of OTP could be erased with somewhat
less energy than the rest of the array as those cells were in other
regions,
suffice it to say these parts didnt last long in the market place...
How long ago was that?. These days you can use a laser to read each bit
right off the chip, this is pretty common when reading embedded eeproms off
dead processors.
Michael C said:Simple question. Will xrays damage electronics? Say if I was to xray the
circuit in my car key?
once, no, a million times maybe. x-rays aren't good for stuff...
cameras, walkmans, laptops, and even car keys go through airport X-ray
machines every day, I've not heard one report of damage.
Jasen Betts said:the sign I saw posted said anything less than about 3200 ASA (most films are
100-400 ASA) wouldn't be adversely affected by the machine.
I've not noticed degredation in regular films after them going once or twice
through the x-ray machine.
Jasen Betts said:cameras, walkmans, laptops, and even car keys go through airport X-ray
machines every day, I've not heard one report of damage.
Michael C said:Surely the xrays used at airports are significantly lower. Last time I got a
tooth xrayed they covered me in a heavy lead blanket and all the staff
vacated the room and hid behind a lead filled wall (not something that
filled me with confidence.
Mr.T said:Which is all very amusing if you consider your brain to be important.
Of course you would not expect dental staff to be experts on X-ray
radiation
though. My dentist can barely manage to get a usable image.
Michael C said:Getting an xray using film is very difficult and made more difficult by the
fact it takes 10 minutes to find out it didn't work. If the patient moves
the film can be no good. Digital sensors are much better because the result
is instant, the image can be lightened or darkened if it is over or under
exposed, the dosage to the patient is about 10 times less and there's no
chemicals. The image is also much larger (size of screen compared to a
couple of cms) and can be zoomed further.
The only drawback is the $14,000
for the sensor (which is apparently just a CCD in a plastic case).
Mr.T said:Absolutely, (and I saw that SC article too
What I can't understand is why it's taking many so long to change. Some
were
doing it years ago.
Which is about a days work for many dentists :-(
Considering the cost of the X-Ray machine in the first place, it's
peanuts.
You can't make a blanket statement that the digital image can be zoomedMichael said:I wouldn't say amusing
Getting an xray using film is very difficult and made more difficult by the
fact it takes 10 minutes to find out it didn't work. If the patient moves
the film can be no good. Digital sensors are much better because the result
is instant, the image can be lightened or darkened if it is over or under
exposed, the dosage to the patient is about 10 times less and there's no
chemicals. The image is also much larger (size of screen compared to a
couple of cms) and can be zoomed further. The only drawback is the $14,000
for the sensor (which is apparently just a CCD in a plastic case).
Michael
Michael C said:The machine that generates the xrays is only $8000 which I think is pretty
reasonable. Dentists do encounter a huge amount of cost running a practice
and don't end up with that big an income considering they are a doctor and
have started their own business. Their income isn't that bad either but
someone could start a restaurant and make a similar income with no
education.
Ken Taylor said:You can't make a blanket statement that the digital image can be zoomed
further than the photographic image.
If the resolution is there then both can be zoomed in.
I would suggest the resolution of the
photographic image is an order of magnitude better than the digital.
If size really matters then a magnifying viewer can be used.
Ken Taylor said:You can't make a blanket statement that the digital image can be zoomed
further than the photographic image. If the resolution is there then both
can be zoomed in. I would suggest the resolution of the photographic image
is an order of magnitude better than the digital. If size really matters
then a magnifying viewer can be used. For the other issues mentioned,
digital wins.
Mr.T said:I assume you have never tried running a restaurant then.
The *average profit* from a dental surgery would exceed the average profit
from a similar outlay restaurant by an order of magnitude at least.
And the number of dentists who go bankrupt^ is exceedingly small
restaurant owners.
(^ even when they do, it's usually because they lost it on the stock
market
or horses!)
Of course they are well educated, but doctor/dentist income is controlled
by
the number of people they let in to the course each year. *FARRRRR* less
than the number of applicants with high enough entrance scores. Limited
supply makes sure there is no competition.
In the restaurant industry, the over supply has the opposite effect.
Michael C said:Don't be silly
How much do you think a surgery would make per dentist?
They do say a dentist will never go broke practicing dentistry.
My point was it is possible, not even that difficult to open a small
business and compete on income with a dentist.