Friday, October 17, 2008

[MW:1217] RE: 1216] Re: How to reduce the exposure time for RT

is there any advantage using copper or composite screens?
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]On Behalf Of raghavendra pemmaraju
Sent: Thursday, October 16, 2008 5:35 PM
To: materials-welding@googlegroups.com
Subject: [MW:1216] Re: How to reduce the exposure time for RT

Dear CKP,
you can use combination of two sources together ( unsharpness is not an issue since the thickness is 100mm and SFD 2m) this will increase the Curie strength of the source.
Also while developing you may increase the Temperature of the developer to 2 deg.C sothat an imporvement of 0.2 H&D of optical density can be had, proportionately you can reduce the exposure time. When you use Combination of films ( double film with minimum optical density of 1.3H&D per film), you are in tern effectively reducing the exposure time by 40% when compared to that of a single film with 2.0H&D optical density.
 
you can even try to use high speed films such as AGFA D8 provided you are achieving the required sensitivity. This will reduce further 30% of exposure time.
Try the above remedies, all the best !
 
regards,
 
RPE

--- On Thu, 10/16/08, CKPurohit <ck@knm-group.com> wrote:
From: CKPurohit <ck@knm-group.com>
Subject: [MW:1215] How to reduce the exposure time for RT
To: materials-welding@googlegroups.com
Date: Thursday, October 16, 2008, 7:04 PM

Dear Group,

 

I need help to find out how to reduce the exposure time for heavy wall thickness RT (above 4" thickness and ID of vessels 4 meter) .

 

Composite film is one of the option. Any other idea ?

 

I heard from my client that there are accelerators available which can be used for developing the film to compensate the reduce time of exposure.

 

We are using Co-60.

 

Regards.

CK


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