unless you live in an enclosed steel box with a cell tower all day you really dont have much to worry about. even then it's still plenty safe, at worst in that scenario you might get a headache from an electric hum.
bluetooth radios are low-powered high frequency waves, they're harmless, arguably you'd get more radiation out of your TV into your eyes or even from the average lightbulb ðŸ«
if you're trying to avoid radiation, try candles and hand-cranked record players -- trade-offs ðŸ¤