The amount of environmental pollution by mercury is to be measured with neutron activation analysis. Neutron...

 

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The amount of environmental pollution by mercury is to be measured with neutron activation analysis. Neutron absorption in the mercury isotope -196, present with 0.15% abundance, activation cross-section 3103 barns, produces the radioactive species -197, half-life 2.67. The smallest activity for which the resulting photons can be accurately analyzed in a sample of river water is 10. If a reactor neutron flux of 1012/(2) is available, how long an irradiation is required to be able to measure mercury contamination of 20 () in a 4-water test sample? The amount of environmental pollution by mercury is to be measured with neutron activation analysis. Neutron absorption in the mercury isotope -196, present with 0.15% abundance, activation cross-section 3103 barns, produces the radioactive species -197, half-life 2.67. The smallest activity for which the resulting photons can be accurately analyzed in a sample of river water is 10. If a reactor neutron flux of 1012/(2) is available, how long an irradiation is required to be able to measure mercury contamination of 20 () in a 4-water test sample?

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