Assertion: polonium | /r/HasProperty | discovered at such high levels
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text: In response to Al Jazeera's report, Dr Ely Karmon, at Herzliya's Institute for Counterterrorism, a specialist in chemical, biological, radiological and nuclear terrorism, said that "the half-life of the substance [i.e., slightly more than 138 days 9 hours] would make it impossible for polonium to have been discovered at such high levels if it had been used to kill Arafat eight years ago.