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Using steady state leaky box and closed galaxy models and the latest primary proton spectrum based on the directly measured data along with the accelerator data on [Formula: see text] production, the [Formula: see text] flux ratio in the interstellar medium has been estimated in the spectral range from 6 to 100 GeV/n. The derived result is in approximate agreement with the balloon borne calorimeter data of Golden et al. We have closed galaxy model for the estimation of the old component and young component of primary proton spectrum from the composite primary proton spectrum obtained from the recent experiments performed by Menn et al., Webber et al., Seo et al., JACEE and others. The derived results differ slightly from the results of Protheroe, Pal and Bhattacharyya.