In accordance with NATO agreed definitions the Ministry of Defence defines fallout as the return to lower atmospheric layers and to earth of radioactive substances projected to high altitude, and contaminated particulate matter and debris absorbed into the cloud of a nuclear burst. Fallout will result from the detonation of a nuclear weapon. Radiological contamination can occur from the use of a radiation dispersion device. The likelihood of either occurring in Iraq is currently assessed as low.
MOD has safety instructions on the measures to protect personnel from radioactive fallout, radiological contamination and Environmental Industrial Hazards. The measures the military adopt follow UK best practice for nuclear protection.