|
The measured count rate (R) of the gamma rays from the decay of a specific isotope
(110Ag) in the irradiated sample can be related to the amount (n) of the original,
stable isotope (109Ag) in the sample through the following equation (1):
R = ε Iγ A = ε Iγ n φ σ
(1-e-λ ti) e-λ td
where:
R = measured gamma-ray count rate (counts per second)
A = absolute activity of isotope A+1Z in sample
ε = absolute detector efficiency
Iγ = absolute gamma-ray abundance
n = number of atoms of isotope AZ in sample
|
φ = neutron flux (neutrons·cm-2·sec-1)
σ = neutron capture cross section (cm2) for isotope AZ
λ = radioactive decay constant (s-1) for isotope A+1Z
ti = irradiation time (s)
td = decay time (s)
|
to "NAA--Quantification (cont'd)"
|
|
University of Missouri-Columbia
