In message , The Natural
Philosopher writes
bof wrote:

In message , The Natural
Philosopher writes

Grunff wrote:

Dave Liquorice wrote:

I guess most comes up from the ground, but what about walls made
of that nice cornish granite?

The reason suspended floors with a 'sump' arrangement work is
because radon is very heavy, and will collect at the lowest point -
even if it is coming from the walls.


Ah. I hadn't thought that through. It has to be heavy, being
radioactive...
Not necessarily, Tritium isn't.


Tritium is not IIRC radioactive...

Well Tritium has a half life of around 12 years, Uranium 235 (the stuff
they make atomic bombs from) has a half life around 700million years.





--
bof at bof dot me dot uk