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A point cloud based method for radiation source representation for cutting operation in the decommissioning of nuclear facilities CHAO Nan¹, LIU Yong-kuo², XIA Hong³, and YANG Li-qun⁴ 1. Harbin Engineering University, Nantong street NO. 145, Harbin, 150001, China (chaonan@hrbeu.edu.cn) 2. Harbin Engineering University, Nantong street NO. 145, Harbin, 150001, China (LYK08@126.com) 3. Harbin Engineering University, Nantong street NO. 145, Harbin, 150001, China (xiahong@hrbeu.edu.cn) 4. Harbin Engineering University, Nantong street NO. 145, Harbin, 150001, China (hanyangrensheng@163.com) Abstract:Nuclear decommissioning tasks involve a large number of cutting activities and result in a frequent change in the structure and produce many irregular objects. It is necessary to assess the dose rate for cutting operation before work to ensure the radiation safety of the staff. The paper presents a flexible radiation source representation method of gamma dose assessment method for cutting operation based on virtual reality technology and Point-Kernel method, and it can be applied to arbitrary geometries. The initial geometry of the radiation source is designed with the three-dimensional computer-aided design tools, and a point cloud model is generated automatically to represent the radiation source. When the cutting operation is performed, the point cloud models of cutting products are generated automatically by dividing the origin point cloud model according to the cutting surface. Then the generated point cloud model is simplified adaptively according to the position of the detecting point, and dose rates can be calculated with the Point-Kernel method. The flexibility and effectiveness of the proposed method was verified by simulating the cutting of different geometries, and the time and dose rate results were compared with that derived from VRBM and MCNP code. Keyword:dose assessment; point cloud model; point kernel method; cutting operation; nuclear facilities decommissioning

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