Re: On the natural uranium hazard :-)


oppenheimers ghost wrote:
On Wed, 29 Mar 2006 13:54:23 -0800, Mel Rowing wrote:
This might be true of substances like coal,
quartz or silica dust
substances that have sharp cornered crytaline or crystal type dust
particles. It might be true for fibres like asbestos or even textiles.

You are talking of a particle 1 micron in diamiter.

They go straight into the alveoli.

If you say so oppy but nobody else does!

So you ignore the physiology along with the meteorology along with the
geology.

Now tell me something about your field data.

In fact the lungs have a very efficient system for clearing themselves
of dust. The internal walls of the alveoli produce mucous. This is
carried through the bronchioles by cillae which are moved backward and
forward by the breathing motion ending up in the throat from whence it
is swallowed (or by less solubrious people spat out) Particles of dust
entering the lungs stick to this mucous. The layer will certainly be
more than 1 micron thick and so the chances of a particle of such size
embedding itself in lung tissue is remote.

I know I'm chucked off the thread but I really can't have you
misleading my students.

Students really are having a rotten time of it these days. Exams dumbed
down, uni's complaining the students maths and english is poor.

The teaching profession is not what it was.

Well certainly not in your case!

.

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