Discontinuity appears in simulated training instruments of nuclear radiation reconnaissance which adopted ellipse numerical model. In order to solve the problem, an improved ellipse numerical model was proposed, in which the contaminated area was taken into count as a whole. The level of nuclear radiation at any position in the contaminated area can be calculated by the improved ellipse numerical model. On the basis of the improved ellipse numerical model, the architecture of the simulated instrument for training of nuclear radiation reconnaissance was proposed. The results of experiments showed that the improved ellipse numerical model not only had the main characteristics of the contaminated area but also successfully solved the problem of numerical discontinuity. Through adjusting the parameters of the contaminated area, the improved training instrument can adapt to different scope of nuclear radiation reconnaissance without any regional restriction.

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