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Technical Discussions
03:05 Jan-02-2016
film factor

Dear friends,
I am new to ndt rt. I would like to know the calculation of film facto. Would you help me please

Thanks sanjey

N B Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 107

N B Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
Joined Sep 2014
11:37 Jan-02-2016
Re: film factor
In Reply to sanjey at 03:05 Jan-02-2016 (Opening).

As you are new to RT, it would be better if you can do this to arrive at Film Factor(FF)

1. Take a few number of the particular film for which FF is needed.
2. Expose each film with the same source and SFD, but give incremental exposure time.
3. Process all the films together for the same processing time, wash and dry the radiographs.
4. Now check the optical density for each radiograph and plot a graph with density on Y axis and exposure time along X axis.
5. Smoothly draw a curve joining the points.
6. This is the characteristic curve or HD curve for this film.
7. Now for your required Optical Density, project and you can get the exposure time from the value on X axis.
8. From this exposure time, you can find the exposure in R as you have the details about the source and it's strength.
9. This exposure shall be your FF for this particular film and for a particular application.

Remember FF always depends on the optical density that you choose for a particular application

N.B. Rengaraju


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