@wong one:
What makes you think it does NOT accumulate?. .Do you have any background info on that?. .It doesnt help to post a subjective impression on that matter.
Does anyone have information on the strength and type of that radiation source used in these scanners compared to medical purpose x-ray scanners?
Which would be the maximum dosis allowed of that specific radiation p.a. ?
Which materials are susceptible to the accumulation of such radiation?
questions, questions, questions ....
rgds
4Screws