Thierry wrote:
We know...

Do we ?

...that during the emission of a
radiotelescope (rare, for tests or to
send SETI msg, Hi!), the radiation can
sterilize people working in the dish.

rolls eyes

Try tin foil pants to match the tin foil hat.

Has someone some idea of the power require
to produce such a effect or any generic
graph (from IEEE standards ?) showing the
risk vs frequency or emitting power ?

Health Canada's Safety Code 6.

Hint - it's not a dish issue with huge dishes. It might be a feed issue
in the worst case. The bigger the dish, the less the issue (the feed
being further away).

Likely, the 600mW cell phone is worse. And the 5w hand held W/T is
even worse than that.

If you own a strong magnet and an electric stove, hold the magnet in
your hand and turn on one stove top electric burner element to max.
Bring the magnet close to the element and feel the very strong
vibrations. (Don't burn your hand.)