A couple of years ago, NASA published a warning. They required anyone
transporting via air to hand carry them onboard. The warning had to do with
high energy X-ray used at some facilities to luggage inspection. They did
not, as I recall, establish any acceptable level of exposure. I haven't
heard anything lately. But, you might bounce this one off the EMPF Helpline.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
Sent: Monday, September 26, 2005 11:17 AM
To: [log in to unmask]
Subject: [TN] X-ray inspection, can it damage devices?
Good Mornin' Everyone!
I hope you all had a good weekend! I worked Saturday, but had
Sunday off. Sat around Sunday and watched the NASCAR race
at the "Monster Mile" in Dover Delaware. 20-year old Kyle Busch
gave Jimmie Johnson a run for his money finishing second at the
green/white/checkered ending....but I digress.....
Anyways, we built an assembly here that has a .050" copper core
in the center of it...not the same assembly as the one I did my "okie
cross-section" on).
It is double-sided SMT, and has BGA's on both sides. I'm doing x-ray
inspection with a Fein Focus Tiger 160, and in order to penetrate the
core and do a proper inspection of the solder joints and spheres of the
BGA's, the x-ray power is up around 120-130kv.
Our customer received a number of the assemblies from us (without test
from us, as they are prototypes and test hasn't been developed yet), and
they are having problems with one of the BGA's.
It's a 100-ball Max-7000 device from Altera, a CMOS EEPROM, and our
customer has been trying to program the device via on-board programming,
but some boards wont program. The x-ray inspection turned out fine. All
BGA's were inspected using oblique angles, so if there was an open joint,
it would have been seen.
They are worried that maybe the x-rays may have damaged the device.
Altera has told our customer that the x-rays shouldn't hurt the device.
I've got
a case number started via email in to Altera (since I can't talk to anyone
on
the phone), asking them myself if x-rays will damage the device. I'm also
going to call Fein Focus and talk to them as well.
But have any of you ever heard of x-ray damaging BGA's?
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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