K feldspar EDS spectrum, 20 keV e<sup>-</sup> beam, Torpy <i>et al.</i> 2020

K feldspar EDS spectrum, 20 keV e^- beam, Torpy et al. 2020

Description	Spectrum of K feldspar from the Tista River, Bangladesh
Reference	Torpy et al. 2020 Torpy, A., Wilson, N., MacRae, C., Pownceby, M., Biswas, P., Rahman, M., & Zaman, M. (2020). Deciphering the Complex Mineralogy of River Sand Deposits through Clustering and Quantification of Hyperspectral X-Ray Maps. Microscopy and Microanalysis, 26(4), 768-792 https://doi.org/10.1017/S143192762000135X
Date measured	2018-05-01
Material	K feldspar [ KAlSi₃O₈ ] Orthoclase specimen (27x17cm), from Minas Gerais, Southeast Region, Brazil © Photo by Didier Descouens (via Wikimedia Commons), CC-BY-SA 4.0
Specimen	Tista 2020 D4 Shaker [CSIRO], Teesta River, Bangladesh Clustered phase map of river sands (D4 shaker), from the Tista River, Bangladesh. From Torpy et al. 2020 © (C) 2020 CSIRO Mineral Resources
Technique	Energy dispersive x-ray spectrometry (EDS)
Instrument	JEOL 8500F
Probe	20 keV electron beam
Beam current	69.64 nA
Probe diameter	2 μm
Detector name	2× Bruker XFLASH
Det. technology	Silicon drift detector (SDD)
Takeoff angle	40°
Max. throughput	260 kcounts/s
Real time	613.439 s
Live time	373.869 s
Dead time	39.0536 %
Channel count	4096
Energy range	-477.548 … 19989.5 eV
Gain	4.99806 eV/channel
Intensity range	2.9358×10⁶ counts
Integral	1.3489×10⁸ counts
Related measurement	K feldspar CL spectrum, 20 keV e^- beam, Torpy et al. 2020 (co-measured)

Composition from this measurement.
Element	Atoms	At%	Wt%
Na	0.112	0.782	0.84
K	1	6.95	12.7
Fe	0.0127	0.0881	0.23
Al	1.14	7.93	10
Si	3.27	22.7	29.8
O	8.85	61.5	46