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Technical Discussions
Dmitri
Consultant
Algeria, Joined Sep 2004, 1

Dmitri

Consultant
Algeria,
Joined Sep 2004
1
01:50 Sep-30-2004
Checks of a radiographic films viewer (negatoscope)

In EA-04/05 "Accreditation for Non-Destructive Testing" Appendix A (Radiographic equipment) is contained the requirement for "Radiographic films viewers (negatoscope) shall be periodically checked for intensity and evenness of illumination".

I have a radiographic films viewer (negatoscope)"WILNOS", but unfortunately have lost the Guidance for operation of that device. In the Guidance should be given the precedure of intensity and evenness of illumination checks.

As I have no Guidance of above mentioned checks, please tell me- which operations can be performed for radiographic films viewer (negatoscope)to check the intensity and evenness of illumination ?

Thanks for your help.


    
 
 
DJ Kallhof
DJ Kallhof
07:57 Sep-30-2004
Re: Checks of a radiographic films viewer (negatoscope)
----------- Start Original Message -----------
: In EA-04/05 "Accreditation for Non-Destructive Testing" Appendix A (Radiographic equipment) is contained the requirement for "Radiographic films viewers (negatoscope) shall be periodically checked for intensity and evenness of illumination".
: I have a radiographic films viewer (negatoscope)"WILNOS", but unfortunately have lost the Guidance for operation of that device. In the Guidance should be given the precedure of intensity and evenness of illumination checks.
: As I have no Guidance of above mentioned checks, please tell me- which operations can be performed for radiographic films viewer (negatoscope)to check the intensity and evenness of illumination ?
: Thanks for your help.
------------ End Original Message ------------
The requirements for film viewers intensity checks is detailed in ASTM E 1742, para. 6.27.4. First you must create a film to cover the entire film viewing area with an even 2.0 density. With the film in place use a digital white light meter and measure the intensity of the light that passes through the film. Figure 2 in 1742 will show you the maximum allowable film density for that viewer.




    
 
 

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