可移动模型校准航空γ能谱仪剥离系数的修正方法研究

Airborne Spectrometer Stripping Coefficient Correction Method Research on Movable Radioactivity Pads

为解决可移动模型与现有大型航空模型校准结果之间的量值统一的关键问题,首先在现有校准方法的基础上,建立了可移动模型校准航空/车载γ能谱仪的方法;再通过专门研制的可移动模型开展试验,经可移动模型校准直升机载、固定翼载、车载等多种大型γ能谱仪试验,证明了可移动模型校准结果满足国家计量标准的基本要求,校准航空/车载γ能谱仪的方法可行。进一步总结剥离系数随模型摆放距离变化规律的基础上,提出了采用可移动模型校准航空γ能谱仪时,应对校准结果进行剥离系数修正,得到的结果证明,在现有航空混合模型上的示值误差更小,修正后的剥离系数更加接近于现有航空模型的校准结果,并给出了可移动模型校准结果的修正方法和修正因子。

In order to solve the key problem of unifying the calibration results between the movable pads and the existing large-scale aviation pads,firstly,based on the existing calibration methods,the calibration method of airborne/vehicleγray spectrometer by movable pads is established;Then,the a set of tests are carried out to calibrate varieties ofγray spectrometers carried by helicopter,fixed wing or vehicle by the specially developed movable pads,which proved the movable pads calibration results meet the basic requirements of the national measurement standard,and it calibrate airborne/vehicleγray spectrometer is feasible.On the basis of further summarizing the variation law of stripping coefficient with the placement distance of the pad,the stripping coefficient of the calibration results should be corrected is proposed when airborneγray spectrometer is being calibrated by movable pads,the indication error of the obtained results are smaller than which on large fixed pads,and the corrected stripping coefficient is closer to the calibration results of the existing fixed pad.The correction method and correction factor of the calibration results of the movable pads are given.