Abell MT; Lange BA; Dollberg DD; Haartz JC; Hornung RW
NIOSH; :1-3 pages
Three procedures for measuring the transmission of dust used as the absorption correction in X-ray diffraction analyses were evaluated. In one method, the diffraction intensity of silver (7440224) was measured as the average value obtained from a number of clean silver filters taken from the same lot used for depositing the dust sample. In the second procedure, the diffraction intensity of silver was measured on one face of each filter before the sample was deposited on the same face for analysis and measurement. In the last procedure, the diffraction intensity was measured on the reverse clean face of each filter where the front face contained the sample previously analyzed. The filter to filter relative standard deviation was 3.7 percent for the first procedure. The two single filter procedures were comparable, however the front reverse procedure was preferred because of time saving considerations. The last procedure provided less error than the averaging procedure. The authors conclude that the differences between the procedures are small enough to make little practical difference.
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