Parameterization of detector efficiency for the standardization of NAa with stable low flux reactors

Dependence of thermal and epithermal neutron self-shielding on sample size and irradiation site

“…The photopeak count rates were converted to specific activities using detector efficiencies calculated by an empirical method [9], which takes into account sample--detector distance, sample geometry and g-ray attenuation in the sample. The measured specific activities were normalized to give G eff .…”