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In this study, by attempting to resolve the angular complication during theparticle generation for the muon tomography applications in the GEANT4simulations, we exhibit an unconventional methodology that is hinged on thedirection limitation via the vectorial construction from the generationlocation to the restriction area rather than using a certain angulardistribution or interval. In other words, we favor a momentum direction that isdetermined by a vector constructed between an initial point randomly chosen ona generative point/plane and a latter point arbitrarily selected on arestrictive plane of the same dimensions with the basal cross section of thevolume-of-interest (VOI). On account of setting out such a generation scheme,we optimize the particle loss by keeping an angular disparity that is directlydependent on the VOI geometry as well as the vertical position of therestrictive plane for a tomographic system of a finite size. We demonstrate ourstrategy for a set of target materials including aluminum, copper, iron, lead,and uranium with a dimension of 40$\times$10$\times$40 $\rm cm^{3}$ over threerestrictive planes of different positions by using a discrete energy spectrumbetween 0.1 and 8 GeV and we compute the scattering angle, the number ofabsorption, and the particle loss. Upon our simulation outcomes, we show thatthe particle generation by means of restrictive planes is an effective strategythat is flexible towards a variety of computational objectives in the GEANT4simulations.

Particle generation through restrictive planes in GEANT4 simulations for potential applications of cosmic ray muon tomography