The one I remember our singing on the first Aldermaston March, the one from London to Aldermaston in 1958 (after that they went the other way so they could end in Trafalgar Square for the rally) began

Strontium 90, Strontium 90
Falling all around
Strontium 90, Strontium 90
Poisoning the ground

I remember we also had a sticker we would stick on the milk dispensing machines that all grocers' shops had outside at the time, which read "Milk + Strontium 90 = Cancer", with the CND logo {aka the Peace Sign Stateside ~~ but let's not get into that again!}.

~M~