Radioisotopes are used for various industrial, medical and resource related tasks. They are fairly well tracked, documented and shielded most places.
The men and women on the ship are experts. No all clear yet tells me there is likely something sinister to this.
Does anybody believe they were unable to get onboard yeasterday? Choppers fly in hurricains and this is more serious then a heart attack (well anybody but me having a heart attack).
Also, since the subject of SHIELDING came up earlier in the Thread.................if I was a terrorist I would have placed this device below the water line of the vessel. Water is GREAT shield against radiation.