exposure time calculation for CS & SS

[mahendran p]

Hi all,         Can any one help me to send the chart/table for the time calculations of RT using Ir192. I would like to know the time taken depends on the wall thickness & curies.     Regards, P.Mahendran

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[agme...@cantv.net]

Hi Mahendran,
What is the tipe of the chart/table? how to use the table depends on the model or manufacturer
the data normally used are:
Film speed factor in mR/h.
Density required
Distance source-film
Thickness
Source Strength

Kind regards.
Gustavo Mendoza
QA/QC Inspector

mar 25, 2010 11:03:33 AM, material...@googlegroups.com wrote:

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Hi all,        Can any one help me to send the chart/table for the time calculations of RT using Ir192. I would like to know the time taken depends on the wall thickness & curies.  Regards,P.Mahendran 

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[Declan Foley]

very little difference between CS & SS exposures unless you get into dense materials like hastelloy. You also need to consider film type, density needed, distance from film, thickness, source strength, screen size, processing conditions ( manual / auto / chemical temperature.......)

You really need to get an exposure calculator and someone who knows what they are doing........

Declan

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[mahendran p]

Hi,     The RT technician mostly will refer that table to set the timing based on the thickness & material(curie), when they shoot. Normally the density should be 2-4.   Regards, P.Mahendran     --- On Fri, 26/3/10, agme...@cantv.net <agme...@cantv.net> wrote:

[Bathula Raghuram (Mumbai - PIPING)]

you may refer the attached file for some guidance

Exposure time (minutes) = FF*SFD2*2t/hvt*60

SS (Ci)*RHM

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of agme...@cantv.net
Sent: Friday, March 26, 2010 4:30 AM
To: material...@googlegroups.com

Subject: Re: [MW:4611] exposure time calculation for CS & SS

[MALLIKARJUN SHAUKAR]

--- Exp time(min)= SFD(CM)XSFD(CM)XFILM FACTORX2 exp(JOB THK(MM)/12.5)X60/(source strength in cix.5x100x100) sfd   source to film distance in cm film factor  from film manufacturer  D7-1.1  D4 -1.1 etc n= job thk/12.5    (hvl of steel 12.5mm) ci strength in ci (souce strength) for Ir 192  .5 R/hr     for ss exp time is 30% more than c.s exp time.(as thumb rule)

[Kale, Bhaskar M]

please find the attached file.

 

regards, Bhaskar Kale

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