In disagreement with results obtained by the authors A. Milojević, M. Kurepa and S. Ribnikar5), we have not found any critical radius in the investigated BF3 proportional counter. Alpha-particles were introduced parallel with the anode into the mica end-window counter filled with BF3-gas of Hgmm 150, and the radial change of the number of impulses was thus studied. In the counter filled with BF3-gas Hgmm 150 and 300, the integral amplitude distribution was investigated in the function of electronic amplification at various distances of the source from the anode. The result obtained by Milojević and collaborators may be due to the impurity of the gas used.
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