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Using publicly available video of a diffusion cloud chamber with a very smallradioactive source, I measure the spatial distribution of where tracks start,and consider possible implications. This is directly relevant to the quantummeasurement problem and its possible resolution, and appears never to have beendone before. The raw data are relatively uncontrolled, leading to caveats thatshould guide future, more tailored experiments. Aspects of the results maysuggest a modification to Born's rule at very small wavefunction, with possiblyprofound implications for the detection of extremely rare events such as protondecay, but other explanations are not ruled out. Speculatively, I introduce twocandidate small-wavefunction Born rule modifications, a hard cutoff, and anoffset model with a stronger underlying physical rationale. Track distributionsfrom decays in cloud chambers represent a previously unappreciated way to probethe foundations of quantum mechanics, and a novel case of wavefunctions withmacroscopic signatures.

Measured distribution of cloud chamber tracks from radioactive decay: a new empirical approach to investigating the quantum measurement problem