1. the history and importance of the problem. All kinds of creatures on earth experience is determined by the radiation and particles that exist in nature (Natural radiations) at all times. To receive the radiation coming from the natural decay of the nuclide primary radiation substances. (Primordial radionuclides) radioactive substances of a series that exist in the soil. Sand and stones naturally and there are also non-radioactive occur in nature, but originate from human actions, such as Atomic reactor to stay. Diagnosis and treatment of cancer or the radioactive dust (Fallout) from nuclear bombs and radioactive material to try small quantities of emission to the environment from coal-fired power plants and nuclear power plants. Kasetsart University campus, it is one of around 24 is equipped with 137 Cs gamma radiation. 4500 radiation strength CU, which is located at the Department of applied radiation and isotopes. Faculty of science, and is adjacent to the radiation and nuclear establishment. The new Institute of technology the national note wakhe (public organization) Atomic Reactor, which is currently a research that residue Management Center, 1200 kW power radioactive waste storage plant with radioactive isotopes and radiation that made the production of pharmaceutical substances and radiation. For this reason, measuring the amount of radioactive nuclide-specific kammantaphap value of natural and man-made, it is very important. In addition, taking the specific nature of the radioactive nuclide kammantaphap to calculate the gamma radiation dose of domain values (Gamma radiation dose) from natural radioactive nuclide which are by nature, which is the birthplace of the largest radiation. It is necessary and important as well.
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