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Technical Discussions
Zeki Cosku Gokce
Zeki Cosku Gokce
07:29 Oct-18-2003
Selenium-75 Gamma Radiography Sources

Does anyone have any experience with Selenium-75 Gamma Radiography Sources,
inspecting pipelines and pipework?



    
 
 
Dent McIntyre
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent McIntyre

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
08:48 Nov-11-2003
Re: Selenium-75 Gamma Radiography Sources
Yes. I have used SE 75 for RT of ASME Code work.

What is your specific question?


    
 
 
Zeki Cosku Gokce
Zeki Cosku Gokce
04:04 Nov-18-2003
Re: Selenium-75 Gamma Radiography Sources
My question will be how it is different then IR 192 as far as the film and exposure times are concerned.
I have read some articles and they talk about special type of film and also talk about longer exposure times. Is that the case?
----------- Start Original Message -----------
: Yes. I have used SE 75 for RT of ASME Code work.
: What is your specific question?
------------ End Original Message ------------




    
 
 
Jason D. Shepard
Jason D. Shepard
08:21 Feb-17-2005
Re: Selenium-75 Gamma Radiography Sources
----------- Start Original Message -----------
: Yes. I have used SE 75 for RT of ASME Code work.
: What is your specific question?
------------ End Original Message ------------
How does Selenium compare to Ir-192 as far as strength and penetarting power? Can it be used for concrete RT like Irirdium? We use Iridium for up to 10 inches of concrete, can we do the same with Selenium? If so, what would our shot times be like?
Thank you




    
 
 
WiJay Heinemann
WiJay Heinemann
01:25 Oct-05-2005
Re: Selenium-75 Gamma Radiography Sources
----------- Start Original Message -----------
: : Yes. I have used SE 75 for RT of ASME Code work.
: : What is your specific question?
: How does Selenium compare to Ir-192 as far as strength and penetarting power? Can it be used for concrete RT like Irirdium? We use Iridium for up to 10 inches of concrete, can we do the same with Selenium? If so, what would our shot times be like?
: Thank you
------------ End Original Message ------------

NO!!!



    
 
 
WiJay Heinemann
WiJay Heinemann
01:33 Oct-05-2005
Re: Selenium-75 Gamma Radiography Sources
----------- Start Original Message -----------
: My question will be how it is different then IR 192 as far as the film and exposure times are concerned.
: I have read some articles and they talk about special type of film and also talk about longer exposure times. Is that the case?
: : Yes. I have used SE 75 for RT of ASME Code work.
: : What is your specific question?
------------ End Original Message ------------

I have used Se75 every day for the last 2 years, the shot times are "roughtly" 3 times longer per specific currie strength when compared to Ir192. That is the only down side I see. The images are comparabule to X-Ray, the 2mr boundry for an unshielded Se75 100ci source is 331.70' vs. 543.10 for Ir192. This makes it easy to work around or with other people near your area of work. The other down side to this is the Kv range. It is nearly imposibul to shoot any large bor pipe, or heavy wall (sc. 160 and up). Se75 is a great companion to the Ir192 on a job where a veriety of pipe sizes and wall thickness exist.


    
 
 
Chuck Davis
Chuck Davis
04:36 Nov-02-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Dent McIntyre at 08:48 Nov-11-2003 .

Does anyone know how much a Selenium camera complete with all accesories costs in North America (Canada or US)? Also sources for 70 curies.

I am the owner of an NDT company in Mexico and am having extreme difficulty getting quotes on anything anywhere here. If anybody up north knows dealers of selenium cameras and sources who could forward me the info it would be much appreciated.

    
 
 
Chuck Davis
Chuck Davis
04:37 Nov-02-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Dent McIntyre at 08:48 Nov-11-2003 .

Does anyone know how much a Selenium camera complete with all accesories costs in North America (Canada or US)? Also sources for 70 curies.

I am the owner of an NDT company in Mexico and am having extreme difficulty getting quotes on anything anywhere here. If anybody up north knows dealers of selenium cameras and sources who could forward me the info it would be much appreciated.

    
 
 
Chuck Davis
Chuck Davis
04:37 Nov-02-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Dent McIntyre at 08:48 Nov-11-2003 .

Does anyone know how much a Selenium camera complete with all accesories costs in North America (Canada or US)? Also sources for 70 curies.

I am the owner of an NDT company in Mexico and am having extreme difficulty getting quotes on anything anywhere here. If anybody up north knows dealers of selenium cameras and sources who could forward me the info it would be much appreciated.

    
 
 
collin maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
05:39 Nov-02-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Chuck Davis at 04:37 Nov-02-2012 .

Chuck
no special camera required unless your planning on "scar" type radiography. Your usual source supplier should be able to get a price. We get ours from South Africa

    
 
 
Jignesh
Jignesh
07:36 Nov-02-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to WiJay Heinemann at 01:33 Oct-05-2005 .

The Rontgen Per Hour Per Meter (RHM) of Se-75 = 0.203, Ir -192 = 0.48 & Co-60 = 1.33, hence Ce-75 is soft radioactive material and required high penetration power & exposure time.

I wish to have any comparision sheet for Ce-75 & Xray, if some body have.

    
 
 
Csaba Hollo
,
Retired, Canada, Joined Feb 2010, 301

Csaba Hollo

,
Retired,
Canada,
Joined Feb 2010
301
23:13 Nov-05-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Chuck Davis at 04:37 Nov-02-2012 .

Google 'QSA Global'

They have everything you need and are able to export to Mexico.

The prices they quote me may be different from the prices they quote you, so I will refrain from doing so.

    
 
 
Alessio Restolfer
NDT Inspector,
D.e M.I. srl, Italy, Joined Aug 2011, 1

Alessio Restolfer

NDT Inspector,
D.e M.I. srl,
Italy,
Joined Aug 2011
1
12:35 Nov-08-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Zeki Cosku Gokce at 04:04 Nov-18-2003 .

For exposure time equal to 'Ir182 enough to calculate the 30% increase in thickness examination and 15% more on time .. in our company we use very often SE75 and we are very comfortable with this method.

Best Regards Alessio.

    
 
 
vimalkumar
vimalkumar
06:59 Dec-16-2012
Re: Selenium-75 Gamma Radiography Sources
In Reply to Zeki Cosku Gokce at 07:29 Oct-18-2003 (Opening).

yes I have used in abhu dhabi uae

    
 
 
Bipul Das
Bipul Das
18:07 Sep-02-2018
Re: Selenium-75 Gamma Radiography Sources
In Reply to WiJay Heinemann at 01:33 Oct-05-2005 .

below 8mm thik pipe is xray and above 8mm thik is gumma who is the asme coad

    
 
 

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