Could ISIS create NUCLEAR BOMB with 'highly dangerous' radioactive material stolen from Iraq?

The substance was stolen last year, and along with similar disappearances from the US, Britain and other countries, worries are growing Islamic State could create a 'dirty bomb'

A stash of "highly dangerous" radioactive material has been stolen from Iraq sparking fears it could fall into the hands of ISIS.
The substance was stolen last year, and along with similar disappearances from the US, Britain and other countries, worries are growing Islamic State could create a dirty bomb.
But could the terror group use the material to make a nuclear bomb?
A dirty bomb combines nuclear material with conventional explosives to contaminate an area with radiation.
But this is in contrast to a nuclear weapon, which uses nuclear fission to trigger a vastly more powerful blast.
"We are afraid the radioactive element will fall into the hands of Daesh," said a senior security official with knowledge of the theft.
 "They could simply attach it to explosives to make a dirty bomb," said the official, who works at the interior ministry and spoke on condition of anonymity as he is also not authorised to speak publicly.