Radioisotopes of francium would presumably be dangerous as well due to their high decay energy and short half-life, but none have been produced in large enough amounts to pose any serious risk.
ɹˌeɪdɪoʊˈaɪsətˌoʊps ʌv fɹˈænsiəm wʊd pɹɪzˈuːməbli biː dˈeɪndʒɚɹəs æz wˈɛl dˈuː tə ðɛɹ hˈaɪ dᵻkˈeɪ ˈɛnɚdʒi ænd ʃˈɔːɹt hˈæflˈaɪf, bˌʌt nˈʌn hɐvbɪn pɹədˈuːst ɪn lˈɑːɹdʒ ɪnˈʌf ɐmˈaʊnts tə pˈoʊz ˌɛni sˈɪɹiəs ɹˈɪsk.