Are there special muller tubes that only measure alpha for example?
Most particle detectors work by detecting the ionization caused by the particle or the secondary effects of that ionization like scintillation light (the exceptions work on Cerenkov light and transition radiation), so it is difficult to say "only detect ionization from alphas".
However, the physics of ionization and the geometry of the deposition depend on the mass, charge and energy of the particle doing the ionization, which gives us many ways to identify the particle involved. Ionization density and profile along tracks, track length compared to calorimetry, pulse shape discrimination in scintillators, combining calorimetry with velocity or momentum determination and so on.
Perhaps the easiest way with moderate energy alphas would be to use a segmented surface detector of some kind, vetoed by a deeper detector with similar segmentation (relying on the fact that alphas range out much faster than gammas or betas). This would not help you to discriminate against heavy fragments, but would be otherwise very reliable.