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Original developer and manufacturer of advanced ultrasonic instruments
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Technical Discussions
Damien
Damien
14:53 Jun-19-2015
Film Speed/ Factor

Im Looking for film factors for agfa d7, d5, d4 and d3 film, note: its not the r factor im looking for.
But the film speed / factor for a castings technology international calculator ,

Kind Regards
Damien

    
 
 Reply 
 
N.B. Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 105

N.B. Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
105
17:20 Jun-20-2015
Re: Film Speed/ Factor
In Reply to Damien at 14:53 Jun-19-2015 (Opening).

Dear Damien,

Film Factor by definition is: Amount of Exposure (R) per unit area of the Film required to produce a desired optical density.
And Inverse of Film Factor is Film Speed. Unit of Film Speed is 1/R.
Now Optical Density shall also depend on film processing conditions like dark room arrangement,fog density, temperature of processing chemicals etc.
So this is a parameter which should be arrived at by taking trial exposures for a particular application i.e. for castings, welds etc.
In general, by experience, given below are the film factors for the films that you had referred. you can make a start with these figures.
The Factors are for IR-192 Gamma Source. These factors shall change for different energy of radiation sources.

1. D-7 -------- 2.2R
2. D-5 -------- 2.7R
3. D-4 -------- 3.5R
4. D-2 -------- 8.0R

Never used D-3. So no idea. Hope the above is useful to you

Regards
N.B. Rengaraju

    
 
 Reply 
 
mukesh
Other, Quality coordinator
Petrofac International Ltd. Kuwait, India, Joined Jun 2015, 6

mukesh

Other, Quality coordinator
Petrofac International Ltd. Kuwait,
India,
Joined Jun 2015
6
05:54 Jul-09-2015
Re: Film Speed/ Factor
In Reply to N.B. Rengaraju at 17:20 Jun-20-2015 .

Dear all,
some where mentioned the D2---9R
anybody noticed this??

    
 
 Reply 
 
Damien
Damien
12:26 Jul-09-2015
Re: Film Speed/ Factor
In Reply to N.B. Rengaraju at 17:20 Jun-20-2015 .

Hi i understand this, but its still not what im looking for, its d4=100 d7= 35 i think...... ect

    
 
 Reply 
 
jon wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

jon wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
08:39 Jul-10-2015
Re: Film Speed/ Factor
In Reply to Damien at 12:26 Jul-09-2015 .

I think you are looking for relative exposure factors where D7 is 1 - start point.

D8 = 0,6
D7 = 1
D5 = 1,5
D4 = 3
D3 = 5
D2 = 8

These values are for IR192. Other energies have other factors, I gleaned this information from GE's website:
http://www.ge-mcs.com/download/x-ray/film/Film/GEIT-40007EN_ndt-film-brochure.pdf

    
 
 Reply 
 
Matt Funnell
NDT Inspector, Level 3 examinar
Hitchiner Manufacturing, USA, Joined Apr 2015, 9

Matt Funnell

NDT Inspector, Level 3 examinar
Hitchiner Manufacturing,
USA,
Joined Apr 2015
9
14:00 Jul-10-2015
Re: Film Speed/ Factor
In Reply to Damien at 14:53 Jun-19-2015 (Opening).

are you looking for something like the correlation to the film speeds of Fuji films (25,50,100,150) to the Agfa distictions?

    
 
 Reply 
 
Damien
Damien
15:13 Jul-13-2015
Re: Film Speed/ Factor
In Reply to Matt Funnell at 14:00 Jul-10-2015 .

Yeah i got it, thanks
D8 = 22

D7 = 35

D5 = 50

D4 = 120

D2 = 250

    
 
 Reply 
 
Matt Funnell
NDT Inspector, Level 3 examinar
Hitchiner Manufacturing, USA, Joined Apr 2015, 9

Matt Funnell

NDT Inspector, Level 3 examinar
Hitchiner Manufacturing,
USA,
Joined Apr 2015
9
15:37 Jul-13-2015
Re: Film Speed/ Factor
In Reply to Damien at 15:13 Jul-13-2015 .

I feel like that's backwards. the higher D number represents a the faster speeds of film.

    
 
 Reply 
 
SELVAN ELANGO
SELVAN ELANGO
10:26 Aug-28-2018
Re: Film Speed/ Factor
In Reply to N.B. Rengaraju at 17:20 Jun-20-2015 .

Agfa d5 film exposure time how to calculate

    
 
 Reply 
 
Clayton Lonsberry
Clayton Lonsberry
18:12 May-15-2019
Re: Film Speed/ Factor
In Reply to N.B. Rengaraju at 17:20 Jun-20-2015 .

What is your desired density with these R-factors? for Example i use a 2.6 r factor for a 2.5 density on d-5.

    
 
 Reply 
 

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