RADIOGRAPHY THICKNESS LIMIT

[tekari123]

Dear All,

Up to what thickness the radiography can be done on materials ..? is there any limitation to thickness beyond which radiography is not recommended as per code..?

Regards

Alok

 

[Duwe6]

All depends. IIRC: X-ray for the first half-inch or less, then Iridium gamma-ray for the next inch or so, then Cobalt gamma-ray up to about 4-inches, then Linear Accelerator to get up to a foot or thicker. {left out cyclotron for 2-inches or so].

X-ray it possible to take to the field, but very difficult. Cyclotron and Linear Accelerator are essentially impossible to use outside of a lab.

 

[69Firebird]

IR-192 is good up to about 3" and cobalt 60 can penetrate 7-8". Obviously as you near the upper limits resolution can be challenging along with the increasing need for back scatter protection as the exposure times increase. We have used Cobalt 60 on many section 8 vessels in the 4-5" material thickness range with good success.

 

[sharmass]

As per ASME Codes, so far you can achieve the required density and IQI sensitivity, any RT technique can be used.
69Firebird suggestions are good engineering practices