Sorry, but you could have made your point in a more hackerish way by saying that the Islamic State is looking into using off the shelf drones to widely distribute Cesium 137 dust harvested from Medical X ray equipment. A devout martyr would have no issue with preparing the Cesium and assembling the device.

Such a weapon would cause great economic damage if used in an urban area, as the city would have to be evacuated until a thorough and expensive clean up was completed by thousands of workers in bunny hazmat suits.