Radium, like radon, is radioactive and is found in small quantities in nature and is hazardous to life if radiation exceeds 20-50 mSv/year.
ɹˈeɪdiəm, lˈaɪk ɹˈeɪdɑːn, ɪz ɹˌeɪdɪoʊˈæktɪv ænd ɪz fˈaʊnd ɪn smˈɔːl kwˈɔntᵻɾiz ɪn nˈeɪtʃɚ ænd ɪz hˈæzɚdəs tə lˈaɪf ɪf ɹˌeɪdɪˈeɪʃən ɛksˈiːdz twˈɛnti dˈæʃ fˈɪfti ˈɛm ˌɛsvˈiː slˈæʃ jˈɪɹ.