Re , the radiation ideas .
When Concorde started , radiation studies were carried out for aircrew .
Conc. , being high up , but not for long and not in extreme N latitudes was not a problem .
The worst risk around was for our Tokyo based CC. Forever running higher N. latitudes on a regular basis for long flight times .
UK based crew went all over the network and thus minimum exposure to long N. latitudes .
rgds condor .