集装箱储运铜矿石γ辐射剂量率的模拟取样估计

Estimation of typical value and confidence interval of gamma-radiation dose rate from tank-transported copper ore by means of bootstrap resampling method

目的对集装箱储运铜矿石γ辐射剂量率代表值及置信区间采用bootstrap模拟取样进行估计。方法对集装箱储运铜矿石γ辐射剂量率现场测量数据基础统计学特征分析，采用内核密度估计对γ辐射剂量率数据分布特征进行研究，依据数据的非正态分布特征，使用bootstrap计算机模拟取样技术对铜矿石γ辐射剂量率现场数据模拟重复取样。结果以多次bootstrap模拟取样的均值与标准差作为铜矿石γ辐射剂量率有限样本代表值及标准差的稳健估计，并给出了估计值的偏移校准百分比置信区间参数为2．76Gy／h与经验百分比置信区间参数为2．616Gy／h。结论为进口铜矿石γ辐射剂量率代表值及置信区间的准确评估提供的新方法具有广泛的适应性。

Objective To investigate the typical value of gamma-radiation dose rate and its confidence interval in tank-transported copper ore by using bootstrap resampling techniques. Methods Bootstrap resampling method, coupled with kernel density estimation, introduced to acquire the typical value of gammaradiation dose rate in copper ore. Results The typical value of gamma-radiation dose rate in copper ore was expressed as the central tendency of the means of resampling, and two kinds of confidence interval, empirical percentile and bias-corrected accelerated confidence interval, were provided as standard error. Conclusion It is clearly demonstrated that this method has an advantage to give a robust description in explanation of central tendency and variation range of gamma-radiation dose rate data profiles.