Physics, 02.07.2019 21:10, artursino

Radiografic inspections.
what is the radiation contrast for lead if two thicknesses of 8.4 mm and 8.8 mm are used to measure it? assume that the attenuation constant for lead is 3.5 cm-1 and the build up factor is 2.0.
a characteristic curve for a particular brand of film shows the following values. what is the gradient, g, of this film?
optical density exposure/mgray
d1 = 1.6 k1 = 2.5 mg
d2 = 4.0 k2 = 4.3 mg
a film with a gradient of 12 has the following values. what would the exposure be at k2?
optical density exposure/mgray
d1 = 1.6 k1 = 2.5 mg
d2 = 4.1 k2 = ? mg

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Radiografic inspections.
what is the radiation contrast for lead if two thicknesses of 8.4 mm...