Perhaps the best-known case is the Goiânia accident of 1987, in which an improperly-disposed-of radiation therapy system from an abandoned clinic in the city of Goiânia, Brazil, was scavenged from a junkyard, and the glowing caesium salt sold to curious, uneducated buyers.
pɚhˈæps ðə bˈɛstnˈoʊn kˈeɪs ɪz ðə ɡˈɔɪənˌiə ˈæksɪdənt ʌv nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi sˈɛvən, ɪnwˌɪtʃ ɐn ɪmpɹˈɑːpɚlidɪspˈoʊzdʌv ɹˌeɪdɪˈeɪʃən θˈɛɹəpi sˈɪstəm fɹʌm ɐn ɐbˈændənd klˈɪnɪk ɪnðə sˈɪɾi ʌv ɡˈɔɪənˌiə, bɹɐzˈɪl, wʌz skˈævɪndʒd fɹʌm ɐ dʒˈʌŋkjɑːɹd, ænd ðə ɡlˈoʊɪŋ sˈiːsiəm sˈɔlt sˈoʊld tə kjˈʊɹɹiəs, ʌnˈɛdʒuːkˌeɪɾᵻd bˈaɪɚz.