What Mike says is all well and good, perhaps ... in places like the UK, that is.
But, what about in "other parts" of the world, where healthcare providers may not be funded by the tax-payer (or, even if they are, not as well-funded as in the UK)?
"Out there", different rules apply, and folk cannot be too fussy. In my experience, too, x-ray engineers in those parts
do know about the need to re-calibrate after installing a new tube!
