Sources of natural background radiation

Abstract

After the major accidents in “Chernobyl” NPP, located on the territory of present-day Ukraine, and then in the USSR in April 1986, in Bulgaria, as well as in most European countries a lack of systems for a continuous measurement of gamma radiation was reported, which have to provide reliable real-time information on radiation status. Consequently, in the European Union, construction of automated systems for continuous monitoring of gamma radiation has begun. Observations on the state of the radiation background in Bulgaria are carried out in parallel in two ways. A serious problem can cause people to cross a state border in random unregulated places and not at a checkpoint.