MIL-DTL-45444C
Table IV
Composition of calibration standard mixtures
Beta HMX, %
Alpha HMX, %
RDX, %
99.70
0.30
0.00
99.40
0.60
0.00
99.00
1.00
0.00
98.00
2.00
0.00
97.00
3.00
0.00
96.00
4.00
0.00
95.00
5.00
0.00
99.00
0.00
1.00
98.00
0.00
2.00
97.00
0.00
3.00
96.00
0.00
4.00
95.00
0.00
5.00
94.00
0.00
6.00
93.00
0.00
7.00
92.00
0.00
8.00
91.00
0.00
9.00
90.00
0.00
10.00
4.7.1.4 Intensity measurement and construction of
calibration curve. Use X-ray diffraction apparatus to measure
the angular intensities of the calibration standard mixtures at
16.90, 17.81, 24.10 and 25.10 degrees two theta as outlined in
4.7.1.5. Use the X-ray diffraction data obtained for the
calibration standard mixtures to plot the calibration standard
curves as indicated below:
RDX - Plot the corrected intensity (cps) at 17.81 degrees
two theta vs. RDX concentration, weight percent. (See example in
Fig. 1).
Alpha HMX - Plot the corrected intensity (cps) at 25.10
degrees two theta vs. alpha HMX concentration, weight percent.
(See example in Fig. 2).
Correction curve for determining alpha HMX in the presence of
RDX: Plot the corrected intensity (cps) at 25.10 degrees vs. RDX
concentration, weight percent, for those samples free of alpha
HMX. (See example in Fig. 3).
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