ɪn ɐ wˈɜːkɪŋ mˈaɪn, ðə ɹˈeɪdɑːn lˈɛvəl kæn biː kəntɹˈoʊld baɪ vˌɛntɪlˈeɪʃən, sˈiːlɪŋ ˈɔf ˈoʊld wˈɜːkɪŋz ænd kəntɹˈoʊlɪŋ ðə wˈɔːɾɚɹ ɪnðə mˈaɪn.
In a working mine, the radon level can be controlled by ventilation, sealing off old workings and controlling the water in the mine.