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[求助]
求翻译一段有关XRF的英文
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求翻译一段话 The method described is x-ray fluorescence applied to PM10, fine (<2.5 μm) and coarse (2.5-10 μm) aerosols particles captured on membrane filters for research purposes in source apportionment. The samplers which collect these particles are designed to separate particles on their inertial flow characteristics producing size ranges which simplify x-ray analysis. The instrument is a commercially available Kevex EDX-771 energy dispersive x-ray spectrometer which utilizes secondary excitation from selectable targets or fluorescers and is calibrated with thin metal foils and salts for 44 chemical elements. Spectra are acquired by menu-driven procedures and stored for off-line processing. Spectral deconvolution is accomplished by a least squares algorithm which fits stored pure element library spectra and background to the sample spectrum under analysis. X-ray attenuation corrections are tailored to the fine particle layer and the discrete coarse particle fraction. Spectral interferences are corrected by a subtractive coefficient determined during calibration. The detection limits are determined by propagation of errors in which the magnitude of error from all measured quantities is calculated or estimated as appropriate. Data are reported in ng/m3 for all samples. Comprehensive quality control measures are taken to provide data on a broad range of parameters, excitation conditions and elements. |
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sltmac(金币+2): 辛苦 2011-09-15 21:36:24
matvey(金币+80, 翻译EPI+1): 2011-09-16 13:41:23
sltmac(金币+2): 辛苦 2011-09-15 21:36:24
matvey(金币+80, 翻译EPI+1): 2011-09-16 13:41:23
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本方法将次级辐射应用于PM10，经过膜分离源分配的气溶胶粒子为研究目标，即通过<2.5 μm膜的粒子为纯粒子，2.5-10 μm之间的为粗粒子。 依据所收集粒子的惯性流动特性产生的粒径范围将其分离，以便于X射线分析。 该仪器为一种商业用的Kevex EDX-771能量扩散X光分光仪，它利用可选择对象或荧光剂的两次激发并能够用薄金属片或盐为44中化学元素校准。光谱由菜单-驱动过程获得并通过离线进程保存。采用最小二乘算法可完成光谱的去回旋。该方法适用于已存储的纯元素实验光谱以及正在分析中的样品光谱背景。X射线弱化纠正使其与纯粒子层相和离散的粗粒子碎片适应。光谱干扰在校正过程中由负系数测定进行更正。检测限由误差传播测定，误差传播即所有的所检测计算或估计的结果中的误差。所有样品的数据报告均为ng/m3。全面质量控制检测用来提供广泛的数据参数，激发条件以及激发因素。 |
2楼2011-09-15 21:20:27