The thermonuclear burn-up in deuterium-tritium (DT) mixtures with various D :T ratios is considered. It is shown that the use of small amounts of tritium simplifies the thermonuclear burn-up in the dense deuterium significantly. The general dependence of the critical burn-up parameter x(c) = rho r(c) upon the D : T ratio, temperature T and initial density rho(o) is studied. In particular, we found that when the D :T ratio decreases the critical bum-up parameter x(c)(T, rho(o)) diminishes very quickly (at fixed T and rho(o)), i.e. the thermonuclear burn-up simplifies when the relative tritium concentration in the DT-mixture grows. The thermonuclear bum-up in the highly compressed deuterides and DT-hydrides of light elements is discussed briefly in the appendix. [References: 28]
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