ɪɹˈɪdiəm wˈʌnhˈʌndɹɪd nˈaɪnti tˈuː hɐz ɐkˈaʊntᵻd fɚðə mədʒˈɔːɹᵻɾi ʌv kˈeɪsᵻz tɹˈækt baɪ ðə jˈuː.ˈɛs nˈuːklɪɹ ɹˈɛɡjʊlətˌoːɹi kəmˈɪʃən ɪnwˌɪtʃ ɹˌeɪdɪoʊˈæktɪv mətˈɪɹiəlz hæv ɡɔn mˈɪsɪŋ ɪn kwˈɔntᵻɾiz lˈɑːɹdʒ ɪnˈʌf tə mˌeɪk ɐ dˈɜːɾi bˈɑːm.
Iridium-192 has accounted for the majority of cases tracked by the U.S Nuclear Regulatory Commission in which radioactive materials have gone missing in quantities large enough to make a dirty bomb.