Together with caesium-134, iodine-131, and strontium-90, caesium-137 was among the isotopes distributed by the Chernobyl disaster which constitute the greatest risk to health.
təɡˌɛðɚ wɪð sˈiːsiəm wˈʌnhˈʌndɹɪd θˈɜːɾi fˈoːɹ, ˈaɪədˌiːn wˈʌnhˈʌndɹɪd θˈɜːɾi wˈʌn, ænd stɹˈɔntiəm nˈaɪnti, sˈiːsiəm wˈʌnhˈʌndɹɪd θˈɜːɾi sˈɛvən wʌz ɐmˌʌŋ ðɪ ˈaɪsətˌoʊps dˈɪstɹɪbjˌuːɾᵻd baɪ ðə tʃˈɜːnəbˌɪl dɪzˈæstɚ wˌɪtʃ kˈɑːnstɪtˌuːt ðə ɡɹˈeɪɾɪst ɹˈɪsk tə hˈɛlθ.