Optimal elements for low-flux neutron activation analysis

Abstract

Neutron activation analysis (NAA) is a multi-element technique capable of detecting major, minor, and trace elements by irradiating samples with neutrons to induce radioactivity. Detection depends on nuclear characteristics like cross-section and half-life, with constraints when using low neutron flux sources. This study identified elements suitable for low-flux NAA through a literature review, focusing on interaction cross-sections and half-lives. Optimal elements have cross-sections of 1–100 barns and half-lives of 10 minutes to 7 days. Nuclides with cross-sections of 1–10 barns were considered if their natural abundance and gamma intensity exceeded 5%, and those with half-lives over 7 days if their cross-section exceeded 60 barns. The results determined 20 elements with their corresponding specific nuclide that satisfy the preferred criteria for low-flux NAA application.