Size of EDS Detector in EMs
- Practical Electron Microscopy and Database -
- An Online Book -  

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


In principle, the bigger size of the EDS detectors should provide better performance. However, in practice, this is not always true because:

         i) The physical geometry of the bigger detectors can further restrict the location of the detectors inside the chamber of electron microscopes (EMs).

                  ii) The location of the EDS detectors may need to be changed if its housing conflicts with other parts inside the chambers of the microscopes, and this change may increase the specimen-to-sensor distance (S) to a clear location, and thus the new S negatively affects the value of the effective solid angles. In this way, it is possible that a larger area detector at a larger distance collects a weaker x-ray signal than that for a smaller area detector at a shorter distance.




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