A Multi-Wavelength Fluorescence Spectrometer*

Isidore Adler; Joseph M. Axelrod

doi:10.1364/JOSA.43.000769

Journal of the Optical Society of America
Vol. 43,
Issue 9,
pp. 769-772
(1953)
•https://doi.org/10.1364/JOSA.43.000769

A Multi-Wavelength Fluorescence Spectrometer

Isidore Adler and Joseph M. Axelrod

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Isidore Adler and Joseph M. Axelrod, "A Multi-Wavelength Fluorescence Spectrometer*," J. Opt. Soc. Am. 43, 769-772 (1953)

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Abstract

A basic multi-wavelength x-ray fluorescence spectrometer has been designed and a two-goniometer prototype built. The instrument is of the dispersive type, using separate crystals, Geiger-Müller detectors, and counting circuits. The system, by providing for the simultaneous determination of more than one element, results in economy of testing time and in improved precision. Finally, an application to one type of ore analysis is described.

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Measurement No.	Count ratio, $\frac{M o K α}{N b K c α}$
1	1.98
2	1.99
3	1.99
4	1.96
5	1.95
6	1.97
7	1.96
8	1.97
9	1.92
10	1.95
11	1.99
12	1.96
13	1.93
14	1.94
15	1.95
16	1.94
17	1.94
18	1.93
19	1.98
20	1.93
21	1.98	Av.=1.956
22	1.94	σ=±0.022
23	1.95	v=±1.1%
24	1.99	Theoretical
25	1.92	v=±1.5%

Standard	$Ratio \frac{N b}{M o}$	Av
1%Nb₂O₅	${\begin{matrix} 0.741 \\ 0.730 \\ 0.741 \end{matrix}}$	0.737
0.33% Nb₂O₅	${\begin{matrix} 0.372 \\ 0.370 \\ 0.379 \end{matrix}}$	0.374
0.11% Nb₂O₅	${\begin{matrix} 0.264 \\ 0.267 \\ 0.260 \end{matrix}}$	0.264
0.037% Nb₂O₅	${\begin{matrix} 0.223 \\ 0.223 \\ 0.219 \end{matrix}}$	0.222

Matrix	$\frac{M o K α}{N b K α}$	Average	Average elapsed time in seconds to give 6400 counts for the Nb
Synthetic	1.34
ilmenite	1.39	1.38	203
	1.40
10% Fe₂O₃, 2% TiO₂,	1.30
remainder Al₂O₃	1.32	1.32	74
	1.33
TiO₂	1.35
	1.31	1.33	145
	1.33

	Percent Nb₂O₅
Sample No.	X-ray	Spectrograph
ABC 133-2a	${\begin{array}{r} 0.157 \\ 0.154 \\ 0.157 \\ Av 0.156 \end{array}}$	0.12
ABC 134-2aA	${\begin{array}{r} 0.164 \\ 0.157 \\ 0.171 \\ Av 0.164 \end{array}}$	0.17
ABC 140-8a	${\begin{array}{r} 0.126 \\ 0.119 \\ 0.124 \\ Av 0.123 \end{array}}$	0.14
ABC 10e	${\begin{array}{r} 0.157 \\ 0.157 \\ 0.150 \\ Av 0.155 \end{array}}$	0.16

Measurement No.	Count ratio, $\frac{M o K α}{N b K c α}$
1	1.98
2	1.99
3	1.99
4	1.96
5	1.95
6	1.97
7	1.96
8	1.97
9	1.92
10	1.95
11	1.99
12	1.96
13	1.93
14	1.94
15	1.95
16	1.94
17	1.94
18	1.93
19	1.98
20	1.93
21	1.98	Av.=1.956
22	1.94	σ=±0.022
23	1.95	v=±1.1%
24	1.99	Theoretical
25	1.92	v=±1.5%

Abstract

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Journal of the Optical Society of America