A statistical study has been made of the grain-spacing of alpha-ray, deuteron and proton tracks in an Ilford $R2$ emulsion with standardized processing and viewing technique. The alpha-rays were from ThC and ThC' and the deuterons and protons from cyclotrons. A theoretical explanation of the difference in grain spacing is given and some applications of the technique in the study of cosmic rays and nuclear research.
No takes yet. Share an insight, caveat, or question.
Wilkins et al. (1938) studied this question.