In message oQDrb.23922$PD2.11399@fed1read05, (formerly)"
writes
Dear Benoit Morrissette:

About government standards: a friend of mine is a chimist at the nuclear
powerplant of Gentilly in Quebec, Canada. He told me that one day, a
friend of
him came in and set off ALL the alarms on her path. After investigation,
they
found out that the day before, she had dental x-rays!! they are now
reevaluating their standards to more realistic values...

Good lord! They must have used X-rays in excess of 5 MeV in order to make
her radioactive. X-rays used in "regular" dental exams are a few keV.
They must have some very special film too, since such high energy X-rays
would pass even through metal fillings like so much smoke.

I think there was another cause. Dental X-rays don't make you radioactive.

It sounds as if the story got mangled in the telling, but isotope tests
would certainly make your blood radioactive. Iodine for thyroid
problems, iron (IIRC) for blood tests.
I saw a news story about this quite recently. The levels are quite safe,
but then so is the activity from a radioactive source being used by a
terrorist if it's suitably packaged.
--
Rabbit arithmetic - 1 plus 1 equals 10
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