You need calibration standards. If you measure cu/ni/au, you can buy
standard for electrolytic gold (Cu/Ni(200 micro-inches)/gold 40
micro-inches), electroless gold (Cu/Ni-P/gold (20 micro-inches), Sn/Pb
eutectic standard also can be found. All of them are very very expansive.
Your machine should have calibration procedures. After you done all the
calibration related to the stuff you are interested, you can measure the
thickness of the layer by the absorption edge counts. You may also want to
correct for Br if it is on FR4 and the peak happen to overlap the elements
of interests. Call your XRF equipment supplier. Normally, the training
package is included in the equipment price (installation and training).
Good luck.
jk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Tempea, Ioan
Sent: Friday, January 06, 2006 9:39 AM
To: [log in to unmask]
Subject: [TN] How to use XRF?
Hi Netters,
we've just become the happy owners of a tabletop XRF analyzer. Works fine,
shows what we need, we have already rejected non-compliant parts, etc.
But there is a litle something... The soft allows for creating applications,
so we can declare that the component has layers, i.e. you can define Au over
Ni over Cu. At this moment the measurements will tell you what is the
thickness of each layer and what is the composition of each layer. Normally
this increases the accuracy of the measurements.
If I x-ray considering layers, I get readings for a SnPb layer that show 14%
lead. If I don't use the layered routine and I shoot through the bulk of the
surface, the Pb goes away, the influence of the Ni and mainly of the Cu
dilutes the Pb to below RoHS threshold.
Hence the question, how should I measure? What is the homogeneous material,
each layer or the bulk?
Thanks,
Ioan
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