Accurate Measurements of Low Z Elements in Sediments and Archaeological Ceramics Using Portable X-ray Fluorescence (PXRF). Johnson, J. Journal of Archaeological Method and Theory, 21(3):563–588, 2014.
doi  abstract   bibtex   
This study seeks to demonstrate the ability of portable X-ray fluorescence (PXRF) to estimate concentrations of K, Ca, and Fe in sediments and archaeological ceramics under controlled conditions. After a discussion of the potential confounding factors in PXRF use, a protocol which attempts to address these issues through repeated measurement, calibration, and re-sampling is detailed. Data generated using this protocol are then tested for accuracy and repeatability. PXRF is argued to be able to produce accurate estimates of K provided the suggested protocol is used, and able to produce repeatable estimates of K and Ca under these same conditions. Other experimental conditions tested failed to produce accurate and repeatable results. Fe results are found to be problematic given the calibration standards used here.
@article{johnson_accurate_2014,
	title = {Accurate {Measurements} of {Low} {Z} {Elements} in {Sediments} and {Archaeological} {Ceramics} {Using} {Portable} {X}-ray {Fluorescence} ({PXRF})},
	volume = {21},
	issn = {1072-5369},
	doi = {10.1007/s10816-012-9162-3},
	abstract = {This study seeks to demonstrate the ability of portable X-ray fluorescence (PXRF) to estimate concentrations of K, Ca, and Fe in sediments and archaeological ceramics under controlled conditions. After a discussion of the potential confounding factors in PXRF use, a protocol which attempts to address these issues through repeated measurement, calibration, and re-sampling is detailed. Data generated using this protocol are then tested for accuracy and repeatability. PXRF is argued to be able to produce accurate estimates of K provided the suggested protocol is used, and able to produce repeatable estimates of K and Ca under these same conditions. Other experimental conditions tested failed to produce accurate and repeatable results. Fe results are found to be problematic given the calibration standards used here.},
	number = {3},
	journal = {Journal of Archaeological Method and Theory},
	author = {Johnson, Jack},
	year = {2014},
	pages = {563--588},
}

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