[SI-LIST] Re: masking of PCB from x-rays
- From: "Russell S. Dudek Jr." <rdudek@xxxxxxxxxxxxxxx>
- To: <Cclewell@xxxxxxxxxxxxx>, <thomas.koshy@xxxxxxxxxxx>
- Date: Wed, 19 Sep 2007 09:21:28 -0400
Koshy,
Although your approach for masking x-rays may be useful for other
considerations aside from copy protecting, i.e. hardening. If someone
really wants to replicate your artwork, they will find a way. Personally,
the (destructive) approach that I would use to reverse engineer a PCB is by
horizontal cross sectioning. Unfortunately, your x-ray shielding would not
stand up to this method.
RD
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Clewell, Craig
Sent: Wednesday, September 19, 2007 9:02 AM
To: 'thomas.koshy@xxxxxxxxxxx'
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: masking of PCB from x-rays
Koshy,
Perhaps some kryptonite might work as this has been known to thwart
superheroes.
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.
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
-----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
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