Yes it is an excellent study, but you need to read the whole thing.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Wednesday, December 16, 2009 3:03 PM
To: [log in to unmask]
Subject: Re: [TN] Lead Free Analyzers
Lee,
To the best of my knowledge, the definitive public information on the
subject is from NPL. It's free from their website. See abstract below.
Chris
Chris Mahanna
Robisan Lab
Title:
XRF measurement of residual materials in electronics.
Author:
Wickham, M, Hunt, C
(An asterisk (*) after an author's name indicates a non-NPL author)
Source:
MAT 4, August 2007
ISSN: 1754-2979
Abstract:
The aim of this study was to assess the suitability of using X-ray
fluorescence (XRF) systems for screening electronics parts in two
applications - compliance with RoHS regulations, and tin whisker mitigation.
Fifteen XRF systems were evaluated using typical electronic components and
assemblies, ranging from contaminated plastic components, through bulk
solder alloys, to solder joints and solder-terminated components. The
results indicate that while PIN (semiconductor diode) and SiLi detector
based systems are suitable for RoHS compliance measurements in plastics and
solders, proportional counter based systems are not. XRF systems using PIN
or SiLi detectors generally proved efficient at distinguishing between
non-compliant components (containing typically 2000+ppm of restricted
substances) and compliant components (typically <500ppm of restricted
substances). For levels between 500ppm and 2000ppm, the use of additional
techniques may be required to provide discrimination. The PIN or SiLi
detectors also proved efficient at distinguishing compliant and noncompliant
systems containing >1000ppm cadmium. Below this level, however, additional
techniques may again be required to provide discrimination. The lower RoHS
limit for cadmium of 100ppm did result in a number of false detections for
this element. Proportional counter based systems were capable of registering
the presence of RoHS-banned elements at levels >3% e.g. such as found in
some plastics. Below this level, however, their ability to detect any banned
substances was questionable, and their use for such applications is not
recommended. For tin whisker mitigation applications, lead levels in excess
of 4% are required for solder samples. All the systems successfully detected
lead at or above this level, providing the sample size was large enough to
fill the measurement window. Indeed, all systems proved capable of
detecting/measuring lead levels above 1% in solder. It is important to
remember that the use of these instruments for both the applications studied
(RoHS compliance, or tin whisker mitigation) requires the operators to have
both a thorough knowledge of the instrument themselves, and a good
understanding of the structure and materials involved in the test samples
These are required to prevent incorrect interpretation of the data provided
i.e. incorrect indications of RoHS compliance, or of tin whisker mitigation
(e.g. for samples having lead in base materials beneath a lead-free
metalisation). Recommendations on instrument practice to obtain meaningful,
repeatable results are given.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: Tuesday, December 15, 2009 9:40 AM
To: [log in to unmask]
Subject: Re: [TN] Lead Free Analyzers
If you google "Portable XRF Analyzers", you would find several.
Good luck.
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Tuesday, December 15, 2009 8:42 AM
To: [log in to unmask]
Subject: [TN] Lead Free Analyzers
Folks,
Since we're on the subject of RoHS, can someone please recommend a good,
accurate, handheld lead free analysis unit, and its approximate cost?
We have a SEM and an XRF, but was wondering if we might be able to identify
something a bit more portable to use in areas besides the lab.
Thanks,
Leland
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