if you are really needed (for prototype for example), use dummy and  
sensor to get the dosage maximum defined, calculate the time exposure  
and control the radiation.  a lot of work and used only for new  
product development.  (if you have all the data, your customer might  
accepted, since it is cutting edge prototype, they might not have  
that much choice).  IMHO.  After you developed dose/time, program  
machine to ensure no exposure exceed the max and use golden device as  
reference for image comparison - that golden device would be dummy  
after the inspection - non-functional.
Done it once, many years ago. major pain.  As the other said, if you  
have alternative AOI for example, don't use X-ray.  (by the way, you  
can use angle fixture if specific feature you need to see).
good luck .
jk
On Sep 6, 2019, at 3:06 PM, Wayne Thayer wrote:

> I thought you guys would get a kick out of something Analog Devices  
> just
> sent me when asked about a voltage reference chip apparently  
> damaged by
> XRAY inspection:
>
> "Given all the variables that can affect device performance, Analog
> Devices, Inc. does not recommend subjecting non-radiation hardened or
> tolerant devices to radiation exposure beyond normal background  
> radiation. "
>
>
> Brilliant, huh? Don't XRAY ANY ADI parts unless they are the tiny  
> subset of
> the radiation hardened line!
>
> My expectation is that they would give a dosage range. Silly me....
>
> Wayne Thayer