ASME V Backscatter 1

[Tony1t]

Hi Everyone,

Is it mandatory to ASME V T-223 which place a lead letter "B" to back of film holder while performed an XRay?
THKS!

 

[Kiwi2671]

Tony,
T-223 states a letter B "shall" be attached - shall is considered mandatory.

However, I spent 4 years as a Radiographer and we did not always attach a letter B.
Whenever we considered there was a chance of backscatter then we would attach a B to the film.
Backscatter radiation only comes into play when there is anything to "reflect" the radiation back onto the film.
The majority of radiation will just penetrate and keep on penetrating until it basically dies out but in certain circumstances after the radiation has passed through what is being radiographed and then passed through the film if it hits something in close proximity of the film it can possibly "reflect" a small amount of radiation back onto the film.
Example: A 10" pipe is radiographed and it is 2" off the floor (source on top of pipe / film underneath the pipe)
The surface on the ground underneath the pipe will tell you whether there is a possibility of backscatter.
From least to worst possibilities you have earth, concrete, steel and then lead.
Hope that helps,
Regards,
Kiwi