Troxler 3241-C - Page 98

Appendix B-2
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Gauge Precision at 6% ASPHALT
(one standard deviation)
80 mCi Americium-241:Beryllium
1 Min.
4 Min.
8 Min.
16 Min.
±0.100%
±0.050%
±0.035%
±0.025%
100 mCi Americium-241:Beryllium
1 Min.
4 Min.
8 Min.
16 Min.
±0.084%
±0.042%
±0.029%
±0.021%
300 mCi Americium-241:Beryllium
1 Min.
4 Min.
8 Min.
16 Min.
±0.070%
±0.035%
±0.025%
±0.018%
NOTES
♦ Range of control mix = 0 to 14% asphalt
♦ Gauge precision is calculated using the ASTM precision
equation:
    
Where:
Slope = slope of the calibration curve at a given %AC
Count = gauge count at a given %AC