Saturday 4 January 2014

Photographic density



 Photographic density 

Q.True regarding photographic density is /are

a.--photographic density refers to log of light incident on a film to light transmitted by the film
b.--opacity refers to abilty of the film to transmit light 
c---.transmittance is equal to the reciprocal of density and measure the ability of the film to stop light 
d--.useful densities in diagnostic radiology range from about 0.3 to 2
e.---a film of density 2 appears dark on viewbox



ANS---.ade-----Photographic density refers to log of light incident on a film to light transmitted by the film.Opacity refers to the ability of the film to stop light .Transmittance is equal to the reciprocal of density and measures abilty  of the film to transmit light.[Chapter 11,Page 149,  4th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].

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