[SI-LIST] Re: masking of PCB from x-rays
- From: "RameshK Cozerv IN HO" <ramesh.k@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 20 Sep 2007 08:38:02 +0530
Hi John,
Contrabandists,use carbon sheet to wrap the material for the purpose....this
will also work.
Lead pencils contain graphite,Do agree with your point,could you please shed
some light about the useage of the lead pencils in protecting the circuit in
the Pcb?
Regards,
Ramesh
Koshy,
They used to make lead pouches for film protection from X-rays when
traveling through airports perhaps that will work, lead pencils contain
graphite or a carbon type compound
John=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Clewell, Craig
Sent: Wednesday, September 19, 2007 6:02 AM
To: 'thomas.koshy@xxxxxxxxxxx'
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: masking of PCB from x-rays
Koshy,=20
Perhaps some kryptonite might work as this has been known to thwart
superheroes. =20
If that doesn't work I think thick dense materials like tungsten, mercury,
uranium and lead will stop the x-rays. X-rays are absorbed and/or
scattered by electrons in a material. So to stop x-rays is you have to pack
as many electrons as possible into the smallest amount of space.
Lead is a material that is capable of doing this and is cheaper and less
toxic than the other materials I mentioned above.
Just a couple of quick thoughts that you may find useful.
1. Try cutting up a lead pencil (if you can find one) and put the lead over
the traces. =20 2. If you have a couple of thermometers lying around you may
be able to lay these over the traces. Since this may mask the finished
product you may need to take multiple views and then cut/paste them
together.
CC=20
-----Original Message-----
From: ThomasKoshy Conzerv IN HO Sr Technical Lead iLabs
[mailto:thomas.koshy@xxxxxxxxxxx]
Sent: Wednesday, September 19, 2007 03:15
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] masking of PCB from x-rays
Sir,
I am interested to mask the components on a printed circuit board from
X-rays to avoid copying the same. Could you pl. suggest an easy method?
Thanks.
Koshy
=20
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