7.7.2 Type B evaluation

In the case of using the Type B approach, the uncertainty is estimated by propagation of the uncertainty of each of the parameters included in the model used for quantification. For example, in the case of using a simplified Shermann formula the analysis of thin samples:

The uncertainty of each individual component is estimated based on fundamental concepts of x-ray spectrometry theory, by designing specific evaluation experiments or based on well-defined values.

For the given example, the uncertainty of , the u(S_i) is defined by the instrumental calibration and the u(t_meas) can be neglected. Examples of uncertainty estimation for different components using a detailed assessment approach can be found in the IAEA Training Course Series (CD-ROM) 53.