International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The competition for applied electronics has been organized for 3 years by the National Academy of Music “Vasil Levski” with the cooperation of the trading company “Elimex”. In the first year it took place only in Veliko Tarnovo, in the second was held except in Veliko Tarnovo and in our faculties in Shumen and Dolna Mitropoliya. This year we have 6 races, including representatives from the BBU, Gabrovo and Varna. Each year the quality of the participants is also improved.

An overview of the emergence and development of nuclear weapons has been made since its creation to the present day. Described are the attempts and consequences of using this weapon. What are the accumulated capacities in the world and what is their prospect for mankind? Described are the parameters of the current nuclear abatement agreements.

The article reviews the environment, radiation transformations and how they affect plants, animals and humans. A theoretical overview of the task is done. Results of measurements of the presence of radioactive isotopes in various non-living and living sites in the region of the main source of water in Veliko Tarnovo – “Yovkovtsi” dam lake and some of the obtained spectrograms are presented.

First began to draw uranium in Bulgaria the germans- in 1938 in Buhovo. In the first year they draw 100 tons of metal. In 1939 they stopped. After the Second World War, uranium mining was renewed in secrecy, but this time by the Soviet-Bulgarian mining company. 48 mines have drawn uranium according to decree № 74 of the Council of Ministers in 1992, the government of Philip Dimitrov takes the decision to liquidate the uranium and another 30 were under investigation and trial operation. It is largely based in southern Bulgaria. Every year the world produces about 42,000 tons of uranium. One third of the yield is in Canada where deposits are 5 million tons. The control in the system of the Ministry of radiation status of the environment which is near former mines extracting uranium, includes field radiometric measurements and laboratory analyzes of soils, waste products in tailing ponds and landfills, sediments, groundwater and surface waters. A network of stations is built for monitoring of soil, groundwater and surface water and air, and produces agricultural products in the areas of uranium mining.

After the Second World War sharply increased testing of nuclear weapons. In making nuclear blast separate radioactive particles and rays isotopes that have an impact on man and nature. Despite the ban still the world are carried out illegal nuclear tests.Observations on the state of the radiation background in Bulgaria are carried out in parallel in two ways. In view of the uncertain international situation it is necessary to strictly observe radiation protection measures and strengthen control.