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This paper describes a new system that has the ability to reduce background components to apply for environmental studies. This system uses gamma spectrometry with semi-empirical self–absorption correction and practical method for routine measurements of the mass activity radionuclides at low energy such as  210 Pb (46.5 keV),  234 Th (63.3 keV) and  226 Ra (186.2 keV). The reliability and precision of proficiency test must pass for final scores all the analytical determinations of received “acceptable” for all radionuclides. Our work shows an experiment developed for the calculation of self-absorption correction in that case that the sample's chemical composition is unknown.

Improvement of passive shielding to reduce background components to determinate radioactivity at low energy gamma rays