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If the neutron flux φ, neutron capture cross section σ, absolute detector
efficiency ε,and absolute gamma-ray abundance Iγ are known, the number
of atoms n of isotope AZ in the sample can be calculated directly. In most cases,
however, a standard is irradiated and counted under similar conditions as the sample, and the mass of
the element in the sample (Wsam) is found by comparing the measured count rates
(R) for the sample and standard through the following equation (2):
where:
Wsam = mass of element in sample (g)
Wstd = mass of element in standard (g)
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Rsam = gamma-ray count rate from the sample (counts per second)
Rstd = gamma-ray count rate from the standard (counts per second)
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University of Missouri-Columbia
