Authors: R. Delmas, M. Fedoroff, and G. Revel
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  • 1 Centre d’Etudes de Chimie Métallurgique 15, rue Georges Urbain 94400 Vitry France
  • | 2 C.E.N. Saclay Laboratoire d’Analyse par Activation P. Süe B.P. 2 91190 Gif-sur-Yvette France
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A simplified calculation model of the recoil and irradiation enhanced diffusion which occur in neutron activation analysis of metals is proposed. Under usual irradiation conditions, the recoil does not exceed 0.01 μm for n, γ reactions and 2 μm for other reactions; the diffusion does not exceed 1 μm. Examples, in which deep impurity diffusion leading to important analytical errors was put forward, are discussed through this calculation model. In most cases, the observed phenomena are not related to diffusion but to other causes such as unefficient etching of the sample surface.