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E4B-INAA

A 30g aliquot is encapsulated in a polyethylene vial and irradiated with flux wires and an internal standard (1 for 11 samples) at a thermal neutron flux of 7 x 10 12  n cm -2  s -1 . After a 7-day period, to allow Na-24 to decay, the samples are counted on a high purity Ge detector with resolution of better than 1.7 KeV for the 1332 KeV Co-60 photopeak.  Using the flux wires, the decay-corrected activities are compared to a calibration developed from multiple certified international reference materials. The standard present is only a check on accuracy and is not used for calibration purposes. From 10-30% of the samples are rechecked by re-measurement.  For values exceeding the upper limits, assays are recommended.

One standard is run for every 11 samples. One blank is analyzed per work order. Duplicates are analyzed when samples are provided.

 

Option E4B-INAA   Elements and Detection Limits (ppm)

Element

Detection Limit

Upper Limit

 

Element

Detection Limit

Upper Limit

As

0.5

10,000

 

Mo

5

10,000

Au

2 ppb

30,000 ppb

 

Nd

5

10,000

Br

0.5

5000

 

Rb

20

10,000

Ce

3

10,000

 

Sb

0.2

10,000

       Co 1 10,000
Se 3 10,000

Cr

5

100,000

 

Sm

0.1

10,000

Cs

1

10,000

 

Ta

0.5

10

Eu

0.2

10,000

 

Tb

0.5

10,000

Hf

1

5000

 

Th

0.2

10,000

Ir

5 ppb

10,000

 

U

0.5

10,000

La

0.5

10,000

 

W

1

10,000

Lu

0.05

10,000

 

Yb

0.2

10,000

                                                

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




Activation Laboratories Ltd. | 41 Bittern Street, Ancaster, Ontario, L9G 4V5, Canada | TF: +1.888.228.5227
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