1. The background and significance of the problem!All living things on the earth contact with radiation and particles existing in the nature (Natural Radiations) is the time to get this from the dissolution of existing natural radiation nuclide of primary radiation (Primordial radionuclides).Sand and stone, natural and have not happened in radioactive nature, but rather from the action of human beings, such as walking, nuclear reactor Diagnosis and treatment of cancer or radioactive dust (Fallout).A small amount of radioactive material and slipped out into the environment from power plants, coal and nuclear power plant
.Kasetsart University. It is a place which is installed 137Cs strength, radiation 4 gamma-ray projector500 Ci, which is located at the Department of applied radiation and isotopes, Faculty of science. And also adjacent to the establishment of nuclear and radiation. National Institute of Technology (public) with a nuclear reactor research.1.200 kW, management center of radioactive waste. With the storage of radioactive waste and zero isotope radiation during the production of pharmaceutical radiation. Because of this.Also, the specific activity of the natural radionuclides to calculate the quantity of โดสของ gamma rays (Gamma radiation dose). From natural radionuclides existing natural radiation source, which is the largest
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