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12/12/2003

 

Rules for using X-ray peaks from Si(Li) detectors for microanalysis. 

? Germanium?

Rules from Dale Newbury  2/5/2003:

Line        keV               Element     Rule

----        -------           -------     ----

K           ... 3                         sum k-alpha and K-beta.

K           3...9.9              - Ge(32) K-alpha only

L           4...9.7              - Au(79) L-alpha

M                             Hg(80)-        M

---- Rules converted to if-then statements.   First draft.

Analysis xray lines (given a list of all the lines for an element):

      Z <= 32                 Use K lines

                  keV < 3     -     sum all K lines

            3 <   keV < 9.9   -     K-alpha

            9.9 < keV         -     shouldn't happen for Z = 32 or less

      Z <= 79                 Use L lines

                  kev < 4     -     sum all L lines

            4 <   keV < 9.7   -     L-alpha

            9.7 < kev         -     shouldn't happen for Z less than 79

      Z > 79                  Use M-alpha (John Small 2/5/2003)

                                    or L-alpha if M-alpha not listed. (Po...)      

Lispix function that implements these rules:

analysis-xray-lines

---------------------------------------------------------------------------------------------

3/3/2003    New rule.  Peak regions seemed to be thrown off by using the less bright beta lines.

            Lispix has no weighting rules.

            Dale says to just use the alpha lines <3 KeV (just as for < 9.9 keV.) 

            Including more space won't gain much.