 Due to the levels of radiation present whilst they are working many radiographers are also required to work late at night when there are few other people present as most industrial radiography is carried out 'in the open' rather than in purpose built exposure booths or rooms.Fatigue, carelessness and lack of proper training are the three most common factors attributed to industrial radiography accidents.Many of the "lost source" accidents commented on by the International Atomic Energy Agency involve radiography equipment.