Ok so as I understand it, cloud chambers function because the electrostatic forces generated by fast energetic charged particles interacting with (or colliding with) the molecules of gas in the chamber along its path strips the gas of electrons, with the resulting ions acting as nucleation sites for the supersaturated alcohol vapor to condense on. With an external magnetic field of a known strength and direction, the type/energy/charge/etc of the particle can be determined by the direction and radius of curvature, track length, etc.
In 1932, C.D. Anderson recorded the first proof of antimatter, capturing an image of what looked like an electron track, only curving in the opposite direction - a positron.
There have been many more images of antimatter tracks in cloud chambers, bubble chambers, ionization chambers, etc since then but my question is this:
HOW/WHY do we see a track AT ALL?
A particle track is on the order of several cm long meaning the energetic particle in question must interact/collide with a HUGE number of gas molecules along its path, and strongly enough to strip them of electrons, otherwise it wouldn’t leave a continuous track. This makes perfect sense for a normal-matter particle interacting with normal-matter gas molecules, and would make sense for an anti-matter particle interacting with anti-matter gas molecules, but for an anti-matter particle and normal-matter gas molecules? Why wouldn’t a positron passing through a chamber of normal-matter just annihilate with the first electron it encountered along its path? How could a positron interact with a full tracks worth of normal-matter molecules strongly enough to strip them of electrons them without annihilating?