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Re: [MW:25738] Why x-ray are use for lower thickness

By Materials & Welding
Hi,
BS EN 1435 specified about the selection of source (permit). Please find the extracted pages for your reference. Since I dont have BS EN ISO 17636 , I refer from BS EN 1435.
 
Thanks& Regards,
 
(Karthik)
QA/QC Manager 
CMI-Thai Services Co.,Ltd. 
50/35 Sermsuwan Road,Tambol Maptaphut 
Amphur Muang Rayong,Rayong 21150
Thailand
www.cmi-services.com 
Tel : +66 38 691 390-2 ext.103 
Fax : +66 38 682 338 
Mobile: +66 892512282 
E-mail : karthikeyan@cmi-services.com
               Karthik6684@yahoo.com


On Saturday, November 19, 2016 11:53 AM, pgoswami <pgoswami@quickclic.net> wrote:


Hello Everyone,
 
I think some back to basics/fundamentals are required to understand which way to proceed, X-Ray or Gamma Ray for radiography. Source intensity vs. required contrast/density is always a challenge to any radiographer. Skilled radiographer could easily manipulate those with experience.
 
For a thickness of 4 mm, X-Ray would be the way to go, not the Gamma Ray, due to its high intensity and failure to get the right contrast. If isotopes are to be chosen, certainly it WILL NOT be  not Ir-192
 
This paper highlights all the merits/demerits of both the techniques and is worth reading.
 
Thanks.
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
pgoswami@quickclic.net
pradip.goswami@gmail.com
 
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prasad Rode
Sent: Wednesday, November 16, 2016 8:28 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:25723] Why xray are use for lower thickness
 
Dear Sir's,
I agree that , we get better quality of radiograph in xray.
I only want to discussed that,
1) If we want to talk about radiography quality, then if required IQI is visible, then we can say that minimum defects is visible as required IQI is visible.
Code also says that radiographs quality or acceptance, depends on visibility of require IQI.
2) my another point is that, in which section or code, it is mention, that below particular thickness of material, xray to be use and above that thickness, gamma is allowed. So that we can insist contractor to do the same.
Thanks for response.
Expecting the same.
Regards
Prasad
On Nov 16, 2016 17:39, "Kannayeram Gnanapandithan" <kgpandithan@gmail.com> wrote:
no, X-ray is the best one

THANKS & BEST REGARDS,
KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349
 
On Wed, Nov 16, 2016 at 11:48 AM, Prasad Rode <purode333@gmail.com> wrote:
BoxbeThis message is eligible for Automatic Cleanup! (purode333@gmail.com) Add cleanup rule | More info

Dear prem and George sir,

Thanks for reply.
I want to ask that if I use the high sourse ir192 and increase the exposure time i.e. time as required by calculation, can I get the good radiographs and using iqi of din standard.
Our thickness of pipe is below 4mm.
We required genuine and technical reason to insist to contractor.
Requesting for response.

Regards
Prasad

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