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In 1895, the discovered X-ray is used for not only in this fiel d of medicine wide but also field. The detection of radiation after, people realized the risk of the r adiation exposured recommended the principle about the protection of radiation by the part of the effort for lowering the radiation exposure. In this recommendation, all unnecessary radiation exposure have to be prevented by All doses include the protection of radiation, general idea of applicable two kinds of that it h as to low maintain. Presently, in the General X-ray room of the clinical, the lead (Pb) was used for the shie lding, However, because it had the problem of the lead poisoning which is fatal in the human body, the altern atives was showed. and Among them, the material that it is the tungsten was presented. in this researc h, the absorbed spectrum according to the thickness in the continuous X-ray energy of the tungsten which is not harmful to the human body through the Monte Carlo simulation, tried to compare with the absorbed spec trum of the lead (Pb).The tungsten confirmed that simulation presumption than result lead in the whole domai n that absorbed probability was higher and it is considered that tungsten shows the absorbed efficiency higher t han the lead in particularly, 70 keV  90 keV and the tungsten is more useful to the X-ray energy cover of th e high energy diagnostic area.

Absorbed Spectrum Comparison of Lead and Tungsten in Continuous X-ray Energy using Monte Carlo Simulation