Atomic-Powered Hats of the Future

OK, it's not really a hat, just a late-1960s "differential multidetector" that used radioisotopes to diagnose (and maybe cause a few) brain tumors. But I swear the eccentric hat junkie Isabella Blow once wore something exactly like it to Ascot.
From The Atom at Work: How Nuclear Power Can Benefit Man (1968), by C.B. Colby.