Co-60 source , a few non technical questions
Co-60 source , a few non technical questions
(OP)
Co60 is the recommended source for thick section castings/forgings etc. However, I am interested in knowing the availability of this source compared to Ir192,in other countries as there are limited cameras in India.
The waiting period for testing is long and quite often the transportation cost over rides the radiography charges.Also if one can provide a cost ratio between Ir192 and Co60.I shall be thankful.
The waiting period for testing is long and quite often the transportation cost over rides the radiography charges.Also if one can provide a cost ratio between Ir192 and Co60.I shall be thankful.
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke





RE: Co-60 source , a few non technical questions
RE: Co-60 source , a few non technical questions
RE: Co-60 source , a few non technical questions
I must take exception to part of your post. We successfully achieve 2-2T sensitivity with Ir-192 at thicknesses up to 2". The exposure times range up to 1/2 hour depending on the activity of the source.
Co-60 can be effectively used for thicknesses up to about 4". The difference being a Co-60 exposure of the 2" thick part will be on the range of 5 minutes (versus 30 for Ir-192).
Depending on the part geometry an option may be a portable X-ray unit. Energies well into the MeV range can be achieved with portable units.
JR97
RE: Co-60 source , a few non technical questions
RE: Co-60 source , a few non technical questions
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RE: Co-60 source , a few non technical questions
Since distance is your friend the area required for a Co60 exposure is at a minimum of twice the distance for IR192.
I been around two very serious radiation exposures from a Co60 source.
The thickness numbers given above for each source a little conservative. I have went to 3.25 thick material with Ir192 with intensifying screens and got acceptable radiographs.
RE: Co-60 source , a few non technical questions
"Ours is a multi national company and cost is not a criteria."
This statement prompted me to pose the few questions especially the cost. I hope someone fills in this request too.
Thanks once again for taking your time to read this long post.
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Co-60 source , a few non technical questions
I checked with an inspection company that is doing some Ir192 work will I compose this. The supervisor of the crews working stated that the last numbers he saw were that Co60 was approximately 4 times the cost per film compared to Ir192 film. These number were for a large turnaround where there was a lot of radiography being accomplished. From my last experience this numbers seems low.
He also stated that Co60 sources are not as available as they were sevral years ago so mobilization could be a big added cost.
I'll call Monday and see if I can get some actual hard numbers for a better comparison.
RE: Co-60 source , a few non technical questions
With Co60 the technician hourly rate is double.
His company doesn't house a Co60 source anymore so they have to rent one for the duration of the job. The rental fee is an adder to the bill. He states that not many companies are housing Co60 sources anymore so rental is becoming standard practice.
He checked his last three jobs where Co60 was used and after all was said and done the cost was 3-4 times the cost of Ir192 Radiography. He had 2 at 3 times the cost and 1 at 4 times the cost.
RE: Co-60 source , a few non technical questions
Is there no way out from this trap?
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Co-60 source , a few non technical questions