Abstract：
In the calibration procedure of area gamma dosemeters, how to accurately evaluate and correct the scattering contribution from the complex environmental factors to the point of test is the key problem to ensure the calibration accuracy. This paper proposed a fast correction method of the scattering contributions in the area gamma dosemeter calibration field. First, Monte Carlo method is employed to simulate the influence of scattering caused by different environmental factors in the calibration field, which is named as semi-panoramic reference radiation field. Then, a prediction model of the relationship between environmental factors and environmental scattering contribution is constructed based on the simulation data through the least squares support vector machine. With the model, the scattering contribution from the environmental factors can be fast estimated to correct the calibration results of the area gamma dosemeters, which will improve the accuracy of the calibration.
摘要：
在区域伽马剂量计的校准程序中，如何准确评价和校正复杂环境因素对测点的散射贡献是保证标定精度的关键问题。本文提出了一种快速校正区域伽马剂量计校准场散射贡献的方法。首先,采用蒙特卡罗方法模拟了标定场不同环境因素对散射的影响,被称为半全景参考辐射场。然后，基于模拟数据，通过最小二乘支持向量机建立了环境因子与环境散射贡献关系的预测模型。有了模型，可以快速估计环境因素的散射贡献，以校正区域伽马剂量计的校准结果，这将提高校准的准确性。
