1 School of Math and Physics, University of South China, Hengyang, 421001 China
2 School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
In the case of loss of the source of the radioactive source, the distribution of radiation field needs to be mastered, which is an important basis for radioactive sources search strategy and the evacuation of the radiation area. In this paper, the inversion of the particle field is put forward by a function constructed for solid radioactive sources. Dose of any point is inversely proportional to the distance from the nuclear radioactive source. The dose of surface near the radioactive source is sharp, steep and concave. The dose surface may be convex where the nuclear radiation field is restored with sparse data by interpolation or fitting. Hence, we made use of mathematical construction techniques to construct dose function tactfully. An inversion model is established which is based on the dose of nodes in the grid. The dose of the grid lines is restored by the cubic spline interpolation. According to an idea of dose dominance of adjacent point, the function of interior point of grid is structured, which is consistent with the characteristics of the radiation field. During the simulation experiment, the dose of node is obtained by MCNP code based on the Monte Carlo method. It is verified that the dose function is close to the real dose field. Therefore, inversion method is feasible, which provides theoretical basis for radioactive sources search and safe evacuation.
Keywords: Dose field of nuclear radiation, inversion, construct, dose dominance of adjacent point.
Received Date: 03/02/2016 Revision Received Date: 27/10/2016 Acceptance Date: 07/11/2016 Electronic publication date: 15/11/2016 Collection year: 2016
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