Trace Element Analysis Laboratory @ EAPS - MIT

Instrumental Neutron Activation Analysis (INAA)

How about INAA for Trace Impurities Studies?



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INAA is very efficient and very useful especially in determining the trace impurities; like determination of trace impurities in solid materials such as:

1)Sorbents for water filters
2)High purity graphites for nuclear reactors
3)High purity silicon powders for the use in the preparation of In-House standards in Analytical Laboratories

Table 1 below provides some observed sensitivities and minimum detection limits as determined in the INAA Lab for the above projects.




Table 1

Observed sensitivities and minimum detection limits of trace impurities as determined in the INAA Lab for high pure materials.
MaterialMaterial Weight ElementSensitivityMinimum Detection Limit
 gram  Counts/hour*ugug
Carbon****As**** ****
Carbon**** Sb**** ****
Carbon****  **** ****
Carbon**** Co**** ****
Carbon**** Cr**** ****
Graphite**** Cl**** ****
Graphite**** K**** ****
Graphite**** Th**** ****
Graphite**** U**** ****
Silica**** Na**** 0.007
Silica**** Cs**** 0.008
Silica**** Sc**** 0.00005
Silica**** Cr**** 0.008
Silica**** Co**** 0.0008
Silica**** Sb**** 0.001
Silica**** Hf**** 0.0006
Silica**** TA**** 0.001
Silica**** Th**** 0.0008
Silica**** U**** 0.003
Silica**** La**** 0.0002
Silica**** Ce**** 0.005
Silica**** Nd**** 0.01
Silica**** Sm**** 0.0002
Silica**** Eu**** 0.0003
Silica**** Tb**** 0.0005
Silica**** Yb**** 0.0005
Silica**** Lu**** 0.00005

Note: '****' To be Filled




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October 22, 2003
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