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![[Deeper Digs] Characterization of Obsidian and Coarse to Fine-Paste Ceramics with Handheld XRF](/images/default-source/opengraph/onlineseminars/xrf_core.tmb-seminar.jpg?Culture=en&sfvrsn=90eda235_1)
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[Deeper Digs] Characterization of Obsidian and Coarse to Fine-Paste Ceramics with Handheld XRF
When: November 15, 2022 10:00-12:00 PM ET
Duration: 2 hours
Certification: RPA-certified
Pricing
Individual Registration: $99 for SAA members; $149 for non-members
Group Registration: $139 for SAA members; $189 for non-members
Lucas R M Johnson, PhD, RPA, Far Western Anthropological Research Group, Inc.
Dr. Johnson's research at Caracol, Belize began in 2010 and initiated his training and application of ED-XRF on over 2,000 ancient Maya obsidian artifacts. Through this geochemical and technological analysis, he learned the basics of XRF physics, the importance of source reference material, and advanced statistical methods used to assign artifacts to known sources to assess ancient regional trade through time. Concurrent with this project, he worked with an international team to characterize obsidian artifacts from two project locations in Ethiopia. Through these projects, he established relationships with XRF specialists and developed a deeper knowledge of portable XRF instruments. Currently, as a practicing archaeologist in cultural resource management, he is expected to apply XRF analysis to obsidian, other volcanic rocks, and potentially other materials in conventional and in often creative ways. As a member of a laboratory team at Far Western Anthropological Research Group, Inc. and working toward advancing technical reports and research papers, he has stayed current with XRF literature describing analyses of various materials, taught other lab staff the fundamentals of XRF, and trained them to use an XRF instrument.
Marc Marino, MA, RPA, University of Arkansas
Marc Marino’s archaeological training with pXRF as an undergraduate student began with Dr. Lucas Johnson at the University of Central Florida Archaeology Laboratory in 2011. Subsequent training with Dr. Wesley D. Stoner, in both pXRF analysis and statistical analysis of data obtained with Neutron Activation Analysis (NAA), built on that foundation at the University of Arkansas, Fayetteville. His internship at the University of Missouri Research Reactor (MURR) with Dr. Brandi Lee MacDonald focused on the trade and exchange of decorated ceramics and obsidian in Aztec Period Mexico (specifically on the independent Tlaxcallan State). While his dissertation research was accomplished using NAA, XRF, and pXRF of obsidian, ceramics, clays, and sediments, Dr. MacDonald also introduced him to other applications of chemical analysis, including the analysis of ochres and pigments. Combined, these experiences have provided exposure to a wide range of projects across broad geographic areas.
Dr. Johnson's research at Caracol, Belize began in 2010 and initiated his training and application of ED-XRF on over 2,000 ancient Maya obsidian artifacts. Through this geochemical and technological analysis, he learned the basics of XRF physics, the importance of source reference material, and advanced statistical methods used to assign artifacts to known sources to assess ancient regional trade through time. Concurrent with this project, he worked with an international team to characterize obsidian artifacts from two project locations in Ethiopia. Through these projects, he established relationships with XRF specialists and developed a deeper knowledge of portable XRF instruments. Currently, as a practicing archaeologist in cultural resource management, he is expected to apply XRF analysis to obsidian, other volcanic rocks, and potentially other materials in conventional and in often creative ways. As a member of a laboratory team at Far Western Anthropological Research Group, Inc. and working toward advancing technical reports and research papers, he has stayed current with XRF literature describing analyses of various materials, taught other lab staff the fundamentals of XRF, and trained them to use an XRF instrument.
Marc Marino, MA, RPA, University of Arkansas
Marc Marino’s archaeological training with pXRF as an undergraduate student began with Dr. Lucas Johnson at the University of Central Florida Archaeology Laboratory in 2011. Subsequent training with Dr. Wesley D. Stoner, in both pXRF analysis and statistical analysis of data obtained with Neutron Activation Analysis (NAA), built on that foundation at the University of Arkansas, Fayetteville. His internship at the University of Missouri Research Reactor (MURR) with Dr. Brandi Lee MacDonald focused on the trade and exchange of decorated ceramics and obsidian in Aztec Period Mexico (specifically on the independent Tlaxcallan State). While his dissertation research was accomplished using NAA, XRF, and pXRF of obsidian, ceramics, clays, and sediments, Dr. MacDonald also introduced him to other applications of chemical analysis, including the analysis of ochres and pigments. Combined, these experiences have provided exposure to a wide range of projects across broad geographic areas.
Applications of XRF in archaeology have expanded beyond the analysis of homogenous materials, such as obsidian, to include more heterogenous materials used, created, formed, or associated with human practices. Applications therefore include characterizations of ceramics, metals, glasses, soils, sediments, plasters, pigments/ residues, cherts, and metavolcanic or metasedimentary rocks. While obsidian analysis is relatively straightforward, the other materials require additional procedures before formulating interpretations based on geochemical attributes. This online seminar presents two case studies, one using obsidian artifacts from the western Great Basin and one using both coarse and fine-paste ceramics from Mesoamerica. In this seminar, the instructors examine appropriate methods to prepare specimens, to assess the precision and accuracy of results obtained, and discuss the strengths and weaknesses of different sample preparation techniques. While it is recognized that a ‘one size fits all’ method does not exist for all pXRF applications, we discuss what factors should be given careful consideration if the goal is to share data across projects and emphasize that such results are of the greatest utility to clients and stakeholders alike.
- Introduce the method of XRF to those who may or may not have access, but are interested in using XRF to answer anthropological questions relating to obsidian and ceramics.
- Present case studies by which attendees may learn how to perform a specific analysis.
- Outline what is required for XRF analysis of a given material and the limitations of XRF in analyzing certain materials.
- Describe the fundamental physics of XRF and how software transforms XRF spectral to analytical units (i.e., calibrations).
- Explain the basics of analyzing parts per million or weight percent versus untransformed photon peak counts (i.e., statistical procedures).