6775 views  Technical Discussions 
 IClampers

IClampers
 03:06 Jul082005 Mathematical Formula's For Gamma exposures Does anyone know the matematic formulas to determine an exposure time? I want to do a spreadsheet based on these formula's but dont know what they are. They are obviously logarithmic functions as can be seen by the layout of the slide rules, but i dont know how to calculate it. Appreciate any help. I want to be able to determine by spreadsheet safe working distances based on size and thickness of piping, use and size of collimator, whether pipe is full or empty, any other shielding in area, etc.... By having spreadsheet I can do what if scenarios very easily to determine this.




 Ed T.

Ed T.
 06:09 Jul092005 Re: Mathematical Formula's For Gamma exposures  Start Original Message  : Does anyone know the matematic formulas to determine an exposure time? I want to do a spreadsheet based on these formula's but dont know what they are. They are obviously logarithmic functions as can be seen by the layout of the slide rules, but i dont know how to calculate it. : Appreciate any help. : I want to be able to determine by spreadsheet safe working distances based on size and thickness of piping, use and size of collimator, whether pipe is full or empty, any other shielding in area, etc.... : By having spreadsheet I can do what if scenarios very easily to determine this.  End Original Message Ice, provide me with your email address. I have some excel spreadsheets that do that.




 Ed Ginzel R & D,  Materials Research Institute, Canada, Joined Nov 1998, ^{1285} 
 05:58 Jul092005 Re: Mathematical Formula's For Gamma exposures Some years ago we provided NDT.net a series of simple problem solving software. These can be freely downloaded at http://www.ndt.net/publicat/bibliog/pss.htmExposure times as were determined by the old slide rules are included in the RT ProblemSolver Regards Ed  Start Original Message  : : Does anyone know the matematic formulas to determine an exposure time? I want to do a spreadsheet based on these formula's but dont know what they are. They are obviously logarithmic functions as can be seen by the layout of the slide rules, but i dont know how to calculate it. : : Appreciate any help. : : I want to be able to determine by spreadsheet safe working distances based on size and thickness of piping, use and size of collimator, whether pipe is full or empty, any other shielding in area, etc.... : : By having spreadsheet I can do what if scenarios very easily to determine this. : Ice, provide me with your email address. I have some excel spreadsheets that do that.  End Original Message 




 IClampers

IClampers
 01:15 Jul102005 Re: Mathematical Formula's For Gamma exposures Thanks Ed. But what are the actual formuala to use to calculate this mathematically. I would like to configure a spreadsheet for my own specific uses and applications. Start Original Message  : Some years ago we provided NDT.net a series of simple problem solving software. These can be freely downloaded at http://www.ndt.net/publicat/bibliog/pss.htm : Exposure times as were determined by the old slide rules are included in the RT ProblemSolver : Regards : Ed : : : Does anyone know the matematic formulas to determine an exposure time? I want to do a spreadsheet based on these formula's but dont know what they are. They are obviously logarithmic functions as can be seen by the layout of the slide rules, but i dont know how to calculate it. : : : Appreciate any help. : : : I want to be able to determine by spreadsheet safe working distances based on size and thickness of piping, use and size of collimator, whether pipe is full or empty, any other shielding in area, etc.... : : : By having spreadsheet I can do what if scenarios very easily to determine this. : : Ice, provide me with your email address. I have some excel spreadsheets that do that.  End Original Message 




 SatKiwi

SatKiwi
 23:35 Feb252011 Re: Mathematical Formula's For Gamma exposures In Reply to IClampers at 03:06 Jul082005 (Opening).
IClampers,
did you ever get this figured out?
I have a formula, however, Im having difficulties fine tuning it... its a little out from the times we are using... I can achieve these times by adjusting a tuning value, but its no help when its for every weld :D 



 Ed T.

Ed T.
 09:03 Feb272011 Re: Mathematical Formula's For Gamma exposures In Reply to SatKiwi at 23:35 Feb252011 .
Download Virus Scan recommended!
Maybe this can help. It was developed by a guy at Livermore Nat'l Labs and was given to me. I have UT formulae as well. 



 Michel Couture NDT Inspector, consultant, Canada, Joined Sep 2006, ^{868} 
 03:56 Feb282011 Re: Mathematical Formula's For Gamma exposures In Reply to Ed T. at 09:03 Feb272011 .
One of my technician actually downloaded it from the internet onto his blueberry. 



 LALIT MOHAN KOTHARI Consultant,  On ..IOCL and BARC(Bhabha Atomic Research Centre).etc, India, Joined Jan 2003, ^{128} 
 11:26 Mar012011 Re: Mathematical Formula's For Gamma exposures In Reply to IClampers at 03:06 Jul082005 (Opening).
Download
IClampers/ALL ,
I am uploding a capsule to you .about RT formula ++++ other information alsoplease download the attach file ( F F# Film Factor)
Thanks&Regard 



 Emman Odron

Emman Odron
 09:56 Jan132012 Re: Mathematical Formula's For Gamma exposures In Reply to IClampers at 03:06 Jul082005 (Opening).
ET = (thickness factor)(source factor)(density factor)(SFD)squared(collimator factor)
divided by 144(curie) 



