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Technical Discussions
Mike
Mike
07:32 Nov-25-2006
Exposure with Cobalt 60

Is a 16 curie colbalt source strong enough to shoot a 28" diameter 3" thick weld using a double wall exposure single wall viewing technique?


    
 
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Anandam
Engineering, - DyGM - Operations & Reliability
Air Liquide India Limited, India, Joined Oct 2001, 13

Anandam

Engineering, - DyGM - Operations & Reliability
Air Liquide India Limited,
India,
Joined Oct 2001
13
07:04 Nov-26-2006
Re: Exposure with Cobalt 60
It hardly matter with the strength of the source as you need to give more exposure time. As far as the three inch double wall is concerned it can work as Cobalt 60 can penetrate up to 180 mm thick of steel. You can see the calculation chart for the same for particular film used.


----------- Start Original Message -----------
: Is a 16 curie colbalt source strong enough to shoot a 28" diameter 3" thick weld using a double wall exposure single wall viewing technique?
------------ End Original Message ------------




    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
02:55 Nov-27-2006
Re: Exposure with Cobalt 60
You might want to check your Ug requirement before you attempt this time consuming endeavor. Unless your physical source size is .186" (4.7244mm) or less your geometric unsharpness will be over .020" (0.508mm). That low a power source will require a faster film and possibly salt screens which will decrease sensitivity. I would look to see if the customer thought ahead and installed a port for a "J" tube.
----------- Start Original Message -----------
: Is a 16 curie colbalt source strong enough to shoot a 28" diameter 3" thick weld using a double wall exposure single wall viewing technique?
------------ End Original Message ------------




    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
03:16 Nov-27-2006
Re: Exposure with Cobalt 60
I must apologize. I knew I was wrong as soon as I closed the first reply. I calculated the total diameter rather than from the front face of the opposite wall. Your source size will have to be .166" (4.216mm) or less.
----------- Start Original Message -----------
: You might want to check your Ug requirement before you attempt this time consuming endeavor. Unless your physical source size is .186" (4.7244mm) or less your geometric unsharpness will be over .020" (0.508mm). That low a power source will require a faster film and possibly salt screens which will decrease sensitivity. I would look to see if the customer thought ahead and installed a port for a "J" tube.
: : Is a 16 curie colbalt source strong enough to shoot a 28" diameter 3" thick weld using a double wall exposure single wall viewing technique?
------------ End Original Message ------------




    
 
 Reply 
 

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