The thermonuclear burn-up of highly compressed deuterated methane CD4 is
considered in the spherical geometry. The minimal required values of the
burn-up parameter x=ρ0⋅rf are determined for various
temperatures T and densities ρ0. It is shown that thermonuclear burn-up
in CD4 becomes possible in practice if its initial density ρ0 exceeds
≈5⋅103g⋅cm−3. Burn-up in CD2T2 methane
requires significantly (≈ 100 times) lower compressions. The developed
approach can be used in order to compute the critical burn-up parameters in an
arbitrary deuterium containing fuel