title: [The applicability of pions to cancer radiotherapy. II. Theoretical analysis of the capture and absorption of pions in polymer].
abstract: A theoretical analysis was attempted to give a remaining number of pi meson, N(X), as function of depth X in a target, lucite as model, under a beam of pi meson. Under the assumption of three different elementary processes, pi-e Rutherford scattering, pi-decay and pi-nucleus interaction, N (X) was theoretically evaluated. It was shown that the estimated stopped points of pi particles agreed well with the experimentally obtained data if the pi-e Rutherford scattering were the main cause of pi momentum reduction. Since the decay of pi meson is negligible in the reduction of pi meson, N (X) is mainly due to pi-nucleus reaction in the region of a small depth but it is due to pi-nucleus Rutherford scattering at a point less than 1.5 cm before the stopped point of pi.
mesh_terms: D004601:Elementary Particles; D008651:Mesons; D008962:Models, Theoretical; D009369:Neoplasms / Q000532:radiotherapy*; D011108:Polymers; D011851:Radioactivity; D011879:Radiotherapy Dosage; D012542:Scattering, Radiation
chemical_list: D011108:Polymers