You will have factors more dangerous levels of radiation if you spend much time in the sun.

Interesting there are cities in the US that have background levels of natural radiation, levels higher than that allowed at nuclear plants. Check out places in Colorado. Yet they have cancer rates no higher than the national average. Some lower.

The ocean alone has enough natural radiation that if we mined it out of the water, it could power the world for thousands of years. And actually there are ways to mine it for about 10c a kwh. That is economical but far higher than land based mining at about 2c per kwh thus no point in doing so.