With Radp 】 an 3D (ATC)we caiculated the accuracy of computerizat { on co 皿 paring the computerized data with the measured one , We compared the pre set beam dat5 with the measured data using O. 1cc chamber in various method of irradiation . The result was that 出 e total error was under 3% . The factor of the error are thought to be the followings 1.Error on taking in the beam data . 2.Error of apProximation and error in 斑 riting with spark pen . 3.Error of effected SSD method in inhomogeneous correction , 1. は じ め に
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