摘要
大气氡子体释放的γ射线严重影响航空γ能谱测量结果,而谱线比大气氡校正方法是航空γ能谱测量大气氡校正数学方法中校正效果较好的一种。本文在此方法的基础上提出了基于快速傅里叶变换扣除散射射线的谱线比大气氡校正方法,研究了改进后新谱线比法不同组分校正系数和高度之间的关系,建立了新谱线比大气氡校正数学模型,并提出了校正系数的地面饱和模型刻度技术。改进后的谱线比大气氡校正方法的适用性及其校正系数的刻度效率得到了提高,节省了谱线比方法应用成本,解决了传统谱线比大气氡校正方法中校正系数采用谱形拟合方法导致物理含义丢失的问题。
γ-ray released by the radon daughter has severe impact on airborne γ-ray spectrometry .T he spectral-ratio method is one of the best mathematical methods for radon background deduction in airborne γ-ray spectrometry .In this paper ,an advanced spectral-ratio method was proposed which deducts Compton scattering ray by the fast Fourier transform rather than tripping ratios ,the relationship between survey height and correction coefficient of the advanced spectral-ratio radon background correction method was studied , the advanced spectral-ratio radon background correction mathematic model was established , and the ground saturation model calibrating technology for correction coefficient was proposed .As for the advanced spectral-ratio＆amp;nbsp;radon background correction method , its applicability and correction efficiency are improved ,and the application cost is saved .Furthermore ,it can prevent the physical meaning lost and avoid the possible errors caused by matrix computation and mathematical fitting based on spectrum shape w hich is applied in traditional correction coefficient .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第1期147-151,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(41204090)
863计划资助项目(2006AA06A207)
关键词
航空γ能谱测量
氡本底校正
谱线比法
校正系数
airborne γ-ray spectrometry
radon background correction
spectral-ratio method
correction coefficient
