Method of simultaneous profilation of hydrogen and born isotopes in the boron containing elements

In the paper the NERD (Neutron-Induced Elastic Recoil Detection) method modification has been discussed. The method is based on 14.1 MeV monochromatic neutrons application for registration of energy spectra both elastic scattering n+1,2,3H and the 10B(n;p,d,t) reaction products. This gives a possibility for simultaneously conducting of hydrogen and boron isotopes profilation in B4C protective coverings of tokamak elements contacting with plasma. Value of the maximal depth is determining by energy and registration angle pf product-particle (for proton in carbon from 20 μm to 1,100 μm). Comparison of experimental and modeling energy spectra by the Monte Carlo methods allows to extract concentration profiles with resolution ∼5 % of analyzed depth. Samples of tokamaks divertors DIII-D covered with boron carbide were studied. Possibility for B4C coverings thickness determination is shown. In these cases these thicknesses make up 115±5 μm and 95±5 μm. The sample which has contact with plasma the volume density on 25 % less than in prototype. A possible reasons for this effect are discussed