caesium chloride
... that one of the worst radiation spill accidents occurred when ignorant thieves broke a steel container with about 90 grams of radioactive caesium chloride?
... that <a href="./Goiânia_accident" id="mwCA4" rel="mw:WikiLink" title="Goiânia accident">one of the worst radiation spill accidents</a> occurred when ignorant thieves broke a steel container with about 90 grams of radioactive <b id="mwCA8"><a href="./Caesium_chloride" id="mwCBA" rel="mw:WikiLink" title="Caesium chloride">caesium chloride</a></b>?