Remote sensing of nuclear accidents using a direction finding detector

There is a great interest to find nuclear accidents as soon as possible and/or to carry out daily monitoring and control for nuclear facilities from a distance. In order to satisfy these requirements, a direction finding gamma-ray detector has been developed as a monitor of gamma-ray leakage from such facilities. The detector comprises three scintillators made of the same material of sodium iodine with thallium NaI(Tl). Computer simulations and laboratory experiments show the possibility of direction finding of gamma rays with reasonable accuracy.