rad = {34.6302, 10.0623, 6.94622, 26.3059, 52.6308, 27.1662, 80.0562, 799.3, 44.5997, 14.0357, 1000};
DeleteCases[rad, x_ /; 10 > x || x > 700]
(* {34.6302, 10.0623, 26.3059, 52.6308, 27.1662, 80.0562, 44.5997, 14.0357} *)
You need an urgent syntax surgery. (* lol *)
Or using the converse, Cases
:
Cases[rad, x_ /; 10 <= x <= 700]