The Definition of "Homogeneous Material" = Material that
cannot be mechnically disjoined.  Thresholds are Maximum
concetration values by weight in Homogeneous materials
(reference 2005/618/EC ammendment to 2002/95/EC RoHS
Directive)

Example: An Integrated Circuit, the Homogeneous Material is
the Plastic Package, Each Wire, the Semiconductor IC, the
Paddle (substrate), and the Eutectic Die Attach material.

Paula

----- Original Message Follows -----
From: "Tempea, Ioan" <[log in to unmask]>
To: [log in to unmask]
Subject: [TN] How to use XRF?
Date: Fri, 6 Jan 2006 09:39:21 -0500
> 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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