RT Source Side/Film Side

[Vino Varghese]

Dear Experts,

 

I would like to know which gives the best result - whether to place the IQI on source or film side?

and what is the reason...

Whether it have affect the result in interpretation?

If we forget to place the IQI as required, i mean on the film side, how to judge from the film?

 

Thanks & Regards

Vino-Doha

[Vinod Kataria]

Dear Vino,

As per Code in some cases you have to place the IQI only on source side for example DWDI (Double wall Double Image). If the IQI is placed on film side it is easy to get the required sensitivity but in double wall double image we have to see the sensitivity for both the wall i.e. near the film and near the source.  

Regarding judgment you can easily make out on looking at Radiograph as you will get the same image of IQI when it is placed on Film side and elongated image of IQI when it is placed on Source Side moreover it is code requirement to put lead letter “F” if the IQI is placed on Film side, hope to clarified your doubt.

With kind regards,

Vinod Kumar Kataria

GM - Operations

Bliss Anand Private Limited,

92B/93B Sector 5

IMT Manesar,Gurgaon,

National Capital Region Delhi.

India .

Phone : +91-124-4366000 (9 Lines)

Mobile Phone : +91-9560199004

Fax : +91-124-2290884

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[Graham Adams]

Hello Vino-Doha,

Most specs require the IQI on the source side, as this will represent the worst case scenario (i.e. longer object to film distance). If it is not possible to place IQI on source side, the IQI must have an “F” placed on it, to show the interpreter he is looking at an apparent sensitivity, not the true sensitivity. Quite difficult to judge from film which side IQI is, unless interpreter knows geometry of test piece, and knows source side not possible. In elliptical shot could notice slight “blowing” of IQI image due to increased OFD.

Regards

Graham Adams

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Vino Varghese
Sent: 14 May 2012 07:16 PM
To: material...@googlegroups.com
Subject: [MW:14262] RT Source Side/Film Side

 

Dear Experts,

--

[mike ball]

Your IQI is simply to measure %sensitivity of the applied technique  to render details, linearity is increased when on source side, however the SFD might have to be increased to be able to capture thinnest wire required and scatter effect, slow not ideal for pipeline situation. ideal for PQT to reset sensitivity when on IQI is on film side. (consider thinner wire)Also ideal offset, elliptical and SWSI. technique.

Hope that helps,

Mike Ball

ofxpt Integrated Quality Services Nig. Ltd

Ugbosu Estate, Effurun, Warri, Delta State 

Nigeria.

+2348037205292

---

From: Vino Varghese <vinopv...@gmail.com>
To: material...@googlegroups.com
Sent: Monday, May 14, 2012 12:15 PM

Subject: [MW:14262] RT Source Side/Film Side

[george....@gr.bureauveritas.com]

Putting the IQI source size the radiation goes through the IQI and then trough the piece and so you get a much better indication for the penetration

RT's without IQI have to be rejected, unless in panoramic RT for pipe welds where IQIs do not need to be on all films

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor
API 510 Inspector

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE
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[Doni Afrizal]

Based on ASME V must on source side. If no access may put on film side.

Based on logic, source side IQI will represent more accurately
radiation absorption of material being inspected.

Regards
Doni
ASNT MT/PT/RI Level 2

[madhan chozhan]

hi

as per ASME section 5, article 2, sub section T-277, the IQI is supposed to be placed on the source side and if it is difficult to place the IQI on source side you can place it on the film side with a letter F made of lead and placed in such a way that it doesnt disturb the welds clarity on film.....

IQI should be located there when u do radiographic testing or else the film is not valid.......

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Thanks & Regards

Srirammadhan

Piping/painting inspector

Great drill Chaaya

Great Ship

Hamriyah Free zone, UAE

[Nandesh Kumar]

Also, if kept on source side, there will be considerable enlargement of entire IQI, includong wire image! --- On Tue, 15/5/12, Doni Afrizal <doni.a...@gmail.com> wrote:

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[Shashank Vagal]

Gents, Correct, IQI(s) is (are) required to be placed on source side with given RT set up conditions to verify detectability and then sensitivity of near surface indications, as they are impaired due to increased OFD. Alternatively, indications within the test object have a better chance of detectability / sensitivity due to decreased OFD. Since it is not always possible to place IQI on source side, it will be appropriate if technique shots are prepared with IQI on film side & then on source side to compare results for accountability. Best regards, Shashank Vagal