**Overview** In this data set, 100,000 "3D images" of particles traversing the liquid argon (LAr) volume are simulated and recorded. We provide this simulation sample for public use. In any of images a 3D pixel ("voxel") has its length that corresponds to 3. Three different sized data are generated in a cubical matrix shape with the length of a side being 192, 512, 768. An image below is an example visualization of an image. ![Sample image of charged particle energy depositions in 3D (from the 5th entry from dlprod_ppn_v09_768px_00.root).][1] The goal of this data set is to train an algorithm that performs a particle type identification at the pixel level in 3D. The samples contain the ground truth label per voxel (3D pixel). For five particle types, truth label values take an integer value between 0 and 4. ![Sample image of five type particle label in 3D (from the same file).Cyan, blue, green, yellow, orange colors are MIP, HIP, electromagnetic shower, delta rays (knocked-off atomic electrons), and Michel electron from a muon decay respectively.][2] Five different particle types include: - Minimum Ionizing Particles (MIP) ... cyan - Heavily Ionizing Particles (HIP) ... blue - Electromagnetic shower with e-/e+ pair-production (shower) ... green - Delta-rays (knocked-off atomic electrons) ... yellow - Michel electron (from muon decay) ... Orange minimum ionizing particles, such as muon **How are these images made?** We refer to an each image as an "event". In each event, there are two types of particles produced. The first is a single, isolated particle. This could be an electron, muon and anti-muon, and proton. There are 1 to 10 of such particles generated, and some are captured within an event. The second type is a multi-particle vertex, a 3D point from which multiple particles are produced. The produced particles include electron, gamma-ray, muon, anti-muon, positive and negative charged pions, and protons. Simulation is performed in a bulk of liquid argon (LAr) and particles are tracked using Geant4 simulation. Particle energy deposition is recorded in every 3mm cubic voxels. [1]: https://files.osf.io/v1/resources/9b3cv/providers/osfstorage/5c057cb7918cc70018c54066?mode=render [2]: https://files.osf.io/v1/resources/9b3cv/providers/osfstorage/5c057cc7918cc7001ac5400d?mode=render