PHƯƠNG PHÁP K-ZERO TRONG PHÂN TÍCH KÍCH HOẠT NEUTRON (k0 - NAA)

Abstract

Neutron activation analysis (NAA) is a method of non-destructive nuclear physics analysis with high sensitivity and accuracy that is capable of solving many practical problems in geological, archaeological, agricultural research, in bio-medicine, materials, environment as well. In NAA, three types of neutron sources are commonly used: isotopic sources, accelerators, and reactors. This study used a neutron source from a research nuclear reactor with a high neutron flux, a neutron source for NAA with the most advantages of the three sources. NAA has different standardization methods: absolute, contrast, single standard, and k-zero, where the k-zero method of NAA (k₀-NAA) is evaluated as a stable (in terms of error) method with high sensor and accuracy, especially when studying environmental, geological, archeological, problems. Given  the relationship between prefixes for many samples, this methodmay demonstrate the superiority of the method. That is why the k₀-NAA method has been selected and used widely as a standard method (reference) used for validation, standard reference materials, and the main method in many studies.