WellCAD Basics - Advanced Logic Technology

Where
�WK
� � C
� � �
�WU
� � K � � C
� � �
�WTh
� �C
�
�
�
�
�
BOOK 1 - WELLCAD BASICS - 169
with
WK, U, Th correspond to the corrected counts of the K, U and Th windows,
K as the calibration matrix and
CK, U, Th being the concentrations to compute.
Please Note: The sensitivity coefficients can be edited manually (click into the cell
and change the value) but as the coefficients are usually determined from a reference
spectrum you will loose the link to the calibration reference.
Creating a model based on count rates
It might happen that you do not have access to the calibration spectrum data
anymore but you have the window count rates and window limits archived
somewhere. In this case you can create a complete calibration model as well.
Follow the steps as described above:
� Start with an empty document and choose the Process > Common >
Spectral Gamma → Window Based Model option.
� Define the energy windows.
K
U
Th
� a
�
K � �a
�
� a
� Add elements and fill in the concentrations for the Calibration References
but do not select any reference spectrum.
� In the Model Properties dialog box the Edit Count Rate button become
available.
1
2
3
b
b
b
1
2
3
c1
�
�
c2
�
c �
3 �