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Technical Discussions
Gowri santhosh Palika
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 52

Gowri santhosh Palika

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
52
01:02 May-18-2008
Radiography contrast

Hi,
how can i define subject contrast and film contrast.
And what is Film gradient?


 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 868

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
868
03:13 May-19-2008
Re: Radiography contrast
Film gradient (G):
The slope of the characteristic curve of a film at a specified optical density D.

Object contrast (Subject Contrast):
The relative difference of radiation transmitted between two regions of an irradiated object.

Visual contrast (Film Contrast):
A density difference perceived visually between two adjacent areas when viewing a radiograph.

These definitions were found in the A-Z Section of this site http://www.ndt.net/ndtaz/ndtaz.php


----------- Start Original Message -----------
: Hi,
: how can i define subject contrast and film contrast.
: And what is Film gradient?
------------ End Original Message ------------




 
 Reply 
 

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