Suggestion by Mr PEMMARAJU RAGHAVENDRA is of a practical approach, a very reasonable one.
For radiograph quality (sensitivity, resolution, definition, etc) and the best technique contact your film manufacturer. D7 may not be a correct choice, but you need to discuss it out with your client. If Mr Ranjan Thakur Lewv 3 (ref: Vinod Kumar Kataria) has any better solution, we await his response.
Shashank Vagal
--- On Fri, 18/3/11, PEMMARAJU RAGHAVENDRA <rpe@hzw.ltindia.com> wrote:
> From: PEMMARAJU RAGHAVENDRA <rpe@hzw.ltindia.com>
> Subject: [MW:10417] RE: 10409] RT with IR 192 for thickness 100 mm
> To: materials-welding@googlegroups.com
> Cc: ranjanthakur_31@yahoo.co.in
> Date: Friday, 18 March, 2011, 6:13 PM
> Use high curie Ir192 ( 100Ci) to
> optimize the exposure time. Also use D7 films or equivalent
> two no.s ( double ) sandwiched between two lead sheets. Thus
> you can save 40% of exposure time of calculated exposure
> time for single film.
> You need to obtain optical density minimum 1.3 H&D per
> film and while viewing the films, you need to view both the
> films by keeping one above the other combined so that the
> cumulative optical density is 2.6H&D.
>
> Thanks
> Regards,
> Raghavendra
> NDE L-III
> L&T
>
>
>
>
>
>
>
>
>
>
>
>
>
> Larsen & Toubro Limited
> www.larsentoubro.com
>
> This Email may contain confidential or privileged
> information for the intended recipient (s) If you are not
> the intended recipient, please do not use or disseminate the
> information, notify the sender and delete it from your
> system.
>
> >>> "Vinod Kataria" <vinod.kataria@blissanand.com>
> 18/03/2011 01:49 pm >>>
> Yes it is possible to do with IR-192 with single film but
> the exposure time
> shall be very high may be 8 - 10 hrs for this thickness.
> You can reduce the
> exposure time by using double film but you will not get
> good results.
> For more information you can consult our Level - 3 Mr.
> Ranjan Thakur also CC
> in this e-mail on his mobile no +91-8010976571.
>
> 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
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com]
> On Behalf Of
> fire_praves@indiatimes.com
>
> Sent: Friday, March 18, 2011 1:09 PM
> To: materials-welding@googlegroups.com
>
> Subject: [MW:10409] RT with IR 192 for thickness 100 mm
>
> Dear Sirs
>
> We have to conduct RT on butt weld of plate thickness 100
> mm. For this Co60
> source is required. But since the norms are very stringent
> and has to be
> done at a very short notice, CO60 source can not be
> obtained.
>
> I am told that there is some RT technique using dual films
> which let us use
> IR 192 source instead of CO60.
>
> Please share with me whether it is possile, what technique
> is it and where
> can i get an appropriate write up from.
>
>
> Regards,
> PRV
>
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