Eugene Gardner

Alpha‐Particle and Deuteron Tracks in Eastman NTA Photographic Plates

Eastman NTA photographic plates have been bombarded with alpha‐particles and deuterons in the 184‐in. Berkeley cyclotron, and photomicrographs of sections of tracks have been made and are reproduced here. The trajectories do not lie in the emulsion for the entire range of the particles, and only short sections of track are available for study. In the tracks of low energy alpha‐particles, and low energy deuterons, there are enough developed grains so that the tracks are nearly continuous. As the energy increases, the number of developed grains in the track decreases, the number for the deuterons decreasing more rapidly than that for the alpha‐particles. In the tracks of alpha‐particles of 200 Mev and lower, and of deuterons of 20 Mev and lower, there are enough developed grains so that the tracks can be followed easily.