Difference between revisions of "Sensitivities Available by NAA"

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====== Written and developed by [http://www.mn.uio.no/kjemi/personer/vit/torbjor/index.html Prof. Tor Bjørnstad] (IFE/UiO)   ======
 
====== Written and developed by [http://www.mn.uio.no/kjemi/personer/vit/torbjor/index.html Prof. Tor Bjørnstad] (IFE/UiO)   ======
  
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====== Return to [[Neutron Activation Analysis]] ======
======Return to [[Neutron Activation Analysis]] ======
 
  
 
 
The sensitivities for NAA are dependent upon the irradiation parameters (i.e., neutron flux, irradiation and decay times), measurement conditions (i.e., measurement time, detector<br>efficiency), nuclear parameters of the elements being measured (i.e., isotope abundance, neutron cross-section, half-life, and gamma-ray abundance). The accuracy of an individual<br>NAA determination usually ranges between 1 to 10 percent of the reported value. Table I lists the approximate sensitivities for determination of elements assuming interference free<br>spectra.  
 
The sensitivities for NAA are dependent upon the irradiation parameters (i.e., neutron flux, irradiation and decay times), measurement conditions (i.e., measurement time, detector<br>efficiency), nuclear parameters of the elements being measured (i.e., isotope abundance, neutron cross-section, half-life, and gamma-ray abundance). The accuracy of an individual<br>NAA determination usually ranges between 1 to 10 percent of the reported value. Table I lists the approximate sensitivities for determination of elements assuming interference free<br>spectra.  
  
 
<br>Table 1. Estimated detection limits for INAA using decay gamma rays. Assuming irradiation in a reactor neutron flux of 1 <math>\cdot</math>10<sup>13</sup> n cm<sup>-2</sup> s<sup>-1</sup>.  
 
<br>Table 1. Estimated detection limits for INAA using decay gamma rays. Assuming irradiation in a reactor neutron flux of 1 <math>\cdot</math>10<sup>13</sup> n cm<sup>-2</sup> s<sup>-1</sup>.  
  
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| align="center" valign="middle" | '''Sensitivity 10-12g'''<br>  
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| align="center" valign="middle" | '''Element'''&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
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| valign="middle" align="center" | '''Element'''&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
 
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[[Category:Laboratory_exercise]][[Category:Neutron_Activation_Analysis]]

Revision as of 10:21, 28 June 2012

Written and developed by Prof. Tor Bjørnstad (IFE/UiO) 
Return to Neutron Activation Analysis

The sensitivities for NAA are dependent upon the irradiation parameters (i.e., neutron flux, irradiation and decay times), measurement conditions (i.e., measurement time, detector
efficiency), nuclear parameters of the elements being measured (i.e., isotope abundance, neutron cross-section, half-life, and gamma-ray abundance). The accuracy of an individual
NAA determination usually ranges between 1 to 10 percent of the reported value. Table I lists the approximate sensitivities for determination of elements assuming interference free
spectra.


Table 1. Estimated detection limits for INAA using decay gamma rays. Assuming irradiation in a reactor neutron flux of 1 [math]\cdot[/math]1013 n cm-2 s-1.

Sensitivity 10-12g
Element                                               
<1
Dy, Eu
1-10
In, Lu, Mn
10-100
Au, Ho, Ir, Re, Sm, W
100-1000
Ag, Ar, As, Br, Cl, Co, Cs, Cu, Er, Ga, Hf, I, La, Sb, Sc, Se, Ta, Tb, Th, Tm, U, V, Yb
103-104
Al, Ba, Cd, Ce, Cr, Hg, Kr, Gd, Ge, Mo, Na, Nd, Ni, Os, Pd, Rb, Rh, Ru, Sr, Te, Zn, Zr
104-105
Bi, Ca, K, Mg, P, Pt, Si, Sn, Ti, Tl, Xe, Y
105-106
F, Fe, Nb, Ne
>106
Pb, S