10MV医療用直線加速器からの漏洩放射線について : 第3報使用室迷路内および入口扉外側の中性子とX線の線量当量分布

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Measurements of neutron and X-ray dose reduction were performed along the central line of the maze in the treatment room of a Mitsubishi ML-15MIIB medical linear acceleratior (10MV photon mode) located at the National Sapporo Hospital. When measured value was plotted on a logarithmic graph paper against the reduced distance from the mouth of the maze (a ratio of real distance to a diameter of a circle with the same cross section as the rectangular opening, the reduction in the 2nd leg of the maze was able to be fitted to a linear function, and the gradients of -3.00 for neutrons and -3.17 for the X-ray were able to be found. It was also found that this plotting method was excellent to express the dose reduction properties in a maze. Neutron dose distributions over some cross sections of the maze were measured. From the results, it was found that the doses reduced in the direction of the maze barrier, and vertical dose distributions were nearly equal in the area of the height up to 2m. As the measurement location approched to the entrance door, the dose distributions was gradually uniformized over the whole of the cross section. The tendency of above distributions were nearly independent to beam directions. The dose reduction of neutrons by the entrance door (about 3mm thickness steel +6mm thickness lead) was 8.7%. It became clear that the capture of thermal neutrons in iron was the main cause for the dose reduction by the door.
公益社団法人日本放射線技術学会の論文
1984-03-01

10MV医療用直線加速器からの漏洩放射線について : 第3報使用室迷路内および入口扉外側の中性子とX線の線量当量分布

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10MV医療用直線加速器からの漏洩放射線について : 第3報 使用室迷路内および入口扉外側の中性子とX線の線量当量分布

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10MV医療用直線加速器からの漏洩放射線について : 第3報使用室迷路内および入口扉外側の中性子とX線の線量当量分布