Calculate radiographic film density relationships, exposure adjustments, and characteristic curve interpolation
Input Parameters
Results
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Required Exposure
mA-min
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Exposure Ratio
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Acceptable Range
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Contrast Sensitivity
%
Note: Film gradient G (gamma) is read from the film characteristic curve. Typical G values: 3.5-5.0 for Class I film, 2.5-3.5 for Class II. Per ASTM E1742 and ASME V Article 2.
Reference
log(E2/E1) = (D2 - D1) / G
G = film gradient (slope of characteristic curve)
Thickness correction: factor = 2^(delta_t / HVL)
Acceptable density: 1.8-4.0 (ASTM E1742)
Contrast sensitivity = 1/(G x D) x 100%