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5S - Short Lived Isotopes - INAA

1 g samples are weighed into medium poly vials and are irradiated at a thermal flux of 7 x 1012 n cm-2s-1 in a computer controlled rabbit system, which sends the INAA vials directly to the source of irradiation then back to the fume hood in the lab for analysis. After appropriate decay times to allow aluminum and other very short lived isotopes to decay, the samples are counted sequentially for the analyte(s) of interest. Values are corrected for decay and compared to a standard calibration.

 

Two standards are analyzed with every work order. Duplicates are analyzed when samples are provided.

   

 

Code 5S (Short Lived Isotopes) Elements and Detection Limits (ppm)

Element

Detection Limit

Al

1

Br

5

Cl

100

Cu

100

Dy

0.5

Ga

10

I

0.5

In

0.1

Mg

0.05%

Mn

0.1

Na

50

Re

1

Ti

50

V

0.1

 

Reference :
Hoffman, E.L., 1992. Instrumental Neutron Activation in Geoanalysis. Journal of Geochemical Exploration, volume 44, pp. 297-319.


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