ɪɹˈɪdiəm wˈʌnhˈʌndɹɪd nˈaɪnti tˈuː ɪz ɐ vˈɛɹi stɹˈɔŋ ɡˈæmɚ ɹˈeɪ ɪmˈɪɾɚ, wɪð ɐ ɡˈæmə dˈoʊskˈɑːnstənt ʌv ɐpɹˈɑːksɪmətli wˈʌn.fˈɪfti fˈoːɹ mjˈuː ˌɛsvˈiː ˈeɪtʃ mˈaɪnəs wˈʌn ˌɛmbˌiːkjˈuː mˈaɪnəs wˈʌn æt θˈɜːɾi sˌiːˈɛm, ænd ɐ spəsˈɪfɪk æktˈɪvᵻɾi ʌv θɹˈiːhˈʌndɹɪd fˈoːɹɾi wˈʌn tˌiːbˌiːkjˈuː dʒˈiː mˈaɪnəs wˈʌn nˈaɪn.twˈɛnti tˈuː kˈeɪ sˈaɪ dʒˈiː mˈaɪnəs wˈʌn.
Iridium-192 is a very strong gamma ray emitter, with a gamma dose-constant of approximately 1.54 μSv·h−1·MBq−1 at 30 cm, and a specific activity of 341 TBq·g−1 (9.22 kCi·g−1).