As of 2005, caesium-137 is the principal source of radiation in the zone of alienation around the Chernobyl nuclear power plant.
æz ʌv tˈuː θˈaʊzənd fˈaɪv, sˈiːsiəm wˈʌnhˈʌndɹɪd θˈɜːɾi sˈɛvən ɪz ðə pɹˈɪnsɪpəl sˈoːɹs ʌv ɹˌeɪdɪˈeɪʃən ɪnðə zˈoʊn ʌv ˌeɪliənˈeɪʃən ɚɹˈaʊnd ðə tʃˈɜːnəbˌɪl nˈuːklɪɹ pˈaʊɚ plˈænt.