Praseodymium (?) in Cu spectra

[Kirsten Travers Moffitt]

Hello all, I recently analyzed a copper object that should date to the 18th century and the spectra contained mostly copper with a small amount of lead and then two very small peaks at 5.04 and 5.41keV which seem to align with the element Praseodymium (confirmed with deconvolution). Has anyone ever encountered this element in copper before? Or am I seeing some matrix effect? Any thoughts would be helpful. I am attaching a pic of the spectrum detail. I collected the data with a Buker Tracer III-V+ Si-Pin detector at 40kV, 3.6uA, no vac, yellow filter for 120 seconds (I re-ran the analyses at 1.5uA and got the same results). Any thoughts would be helpful. Thanks! Kirsten Moffitt please email me at kmof...@cwf.org (I just noticed my email is incorrect above)

[Lee Drake]

Any chance it is the Vanadium K-alpha line? See 2.51 (page 127) here: https://www.rsc.org/suppdata/books/178801/9781788014229/bk9781788014229.pdf. The L-beta doesn't quite align right, and the L-alpha should lean just a hair further to the right based on the relative intensities of the emissions. 

- Lee

On Fri, Jun 7, 2024 at 9:41 AM Kirsten Travers Moffitt <ktra...@cwf.org> wrote:

Hello all, I recently analyzed a copper object that should date to the 18th century and the spectra contained mostly copper with a small amount of lead and then two very small peaks at 5.04 and 5.41keV which seem to align with the element Praseodymium (confirmed with deconvolution). Has anyone ever encountered this element in copper before? Or am I seeing some matrix effect? Any thoughts would be helpful. I am attaching a pic of the spectrum detail. I collected the data with a Buker Tracer III-V+ Si-Pin detector at 40kV, 3.6uA, no vac, yellow filter for 120 seconds (I re-ran the analyses at 1.5uA and got the same results). Any thoughts would be helpful. Thanks! Kirsten Moffitt please email me at kmof...@cwf.org (I just noticed my email is incorrect above)

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[Arlen Heginbotham]

One possibility would be that it is Vanadium.  4.95 and 5.43.  Has been intentionally added to copper apparently...

• https://doi.org/10.1007/BF00810553

Arlen

Arlen Heginbotham, Ph.D.

Conservator

The J. Paul Getty Museum

1200 Getty Center Drive, Su. 1000

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(310) 440-7178

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From: px...@googlegroups.com <px...@googlegroups.com> on behalf of Kirsten Travers Moffitt <ktra...@cwf.org>
Sent: Friday, June 7, 2024 8:36 AM
To: pXRF for Cultural Heritage <px...@googlegroups.com>
Subject: [pxrf] Praseodymium (?) in Cu spectra

 

Hello all, I recently analyzed a copper object that should date to the 18th century and the spectra contained mostly copper with a small amount of lead and then two very small peaks at 5.04 and 5.41keV which seem to align with the element Praseodymium (confirmed with deconvolution). Has anyone ever encountered this element in copper before? Or am I seeing some matrix effect? Any thoughts would be helpful. I am attaching a pic of the spectrum detail. I collected the data with a Buker Tracer III-V+ Si-Pin detector at 40kV, 3.6uA, no vac, yellow filter for 120 seconds (I re-ran the analyses at 1.5uA and got the same results). Any thoughts would be helpful. Thanks! Kirsten Moffitt please email me at kmof...@cwf.org (I just noticed my email is incorrect above)

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[Alexander Seyfarth Mineralogical Analysis]

Rounding to 1^st digit will be fine for a PinDiode setup …

 

Pr LA1 is at 5 kEV and 5.5 . The Escape Peak from Cu is at 6.26 and very low

V LA is at 5 keV and KB1 at 5.4 which matches and is more probable than Pr .

 

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From: 'Arlen Heginbotham' via pXRF for Cultural Heritage <px...@googlegroups.com>
Date: Friday, June 7, 2024 at 4:40 PM
To: px...@googlegroups.com <px...@googlegroups.com>, kmof...@cwf.org <kmof...@cwf.org>
Subject: Re: [pxrf] Praseodymium (?) in Cu spectra

One possibility would be that it is Vanadium.  4.95 and 5.43.  Has been intentionally added to copper apparently...

• https://doi.org/10.1007/BF00810553

Arlen

 

Arlen Heginbotham, Ph.D.

Conservator

The J. Paul Getty Museum

1200 Getty Center Drive, Su. 1000

Los Angeles, CA 90049

(310) 440-7178

 

---

From: px...@googlegroups.com <px...@googlegroups.com> on behalf of Kirsten Travers Moffitt <ktra...@cwf.org>
Sent: Friday, June 7, 2024 8:36 AM
To: pXRF for Cultural Heritage <px...@googlegroups.com>
Subject: [pxrf] Praseodymium (?) in Cu spectra

 

Hello all, I recently analyzed a copper object that should date to the 18th century and the spectra contained mostly copper with a small amount of lead and then two very small peaks at 5.04 and 5.41keV which seem to align with the element Praseodymium (confirmed with deconvolution). Has anyone ever encountered this element in copper before? Or am I seeing some matrix effect? Any thoughts would be helpful. I am attaching a pic of the spectrum detail. I collected the data with a Buker Tracer III-V+ Si-Pin detector at 40kV, 3.6uA, no vac, yellow filter for 120 seconds (I re-ran the analyses at 1.5uA and got the same results). Any thoughts would be helpful. Thanks! Kirsten Moffitt please email me at kmof...@cwf.org (I just noticed my email is incorrect above)

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[Alejandro Germanier]

Hello

The L lines (L-alpha and L-beta) of Praseodymium have similar intensities, as seen in the Lead lines. In this spectrum the lines have the approximate intensity ratio of K-alpha and K-beta, according to the previous comments, it may be Vanadium.

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