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This work is meant to evidence the possibility of studying isotopic patterns of various environmental samples by means of gamma-ray spectrometry following neutron irradiation with a small intensity source. Patterns have a natural component due to the natural radioactive series and an artificial one, obtained following neutron irradiation. The goal is to evidence a low cost, rapid and accurate method and show main corrections and optimizations needed to improve actual and future results that allow material tracking in some cases, including in-situ gamma spectrometry under water.