Multiparticle versus single sequential emission in nuclear evaporation processes

Pinheiro, Antonio Romero da Costa; Assis, Leonardo P. G. De; Duarte, S. B.; Santos, Bruna Michalski dos; Gonçalves, Marco Antônio

doi:10.1103/physrevc.93.034612

Cited by 1 publication

(1 citation statement)

References 21 publications

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“…Nuclear interactions are relevant at these energies, and up to 70% of the incident beam fluency is degraded by the action of these interactions [18]. In this approach we indirectly took into account nuclear density fluctuation effects and our results are in good agreement with data of pion production in nucleus-nucleus reactions [19][20][21].…”

Section: Introductionsupporting

confidence: 67%

Upper bound dose values for meson radiation in heavy-ion therapy

Rabin¹,

Gonçalves

Duarte

et al. 2018

J. Radiol. Prot.

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Radiation treatment of cancer has evolved to include massive particle beams, instead of traditional irradiation procedures. Thus, patient doses and worker radiological protection have become issues of constant concern in the use of these new technologies, especially for proton- and heavy-ion-therapy. In the beam energies of interest of heavy-ion-therapy, secondary particle radiation comes from proton, neutron, and neutral and charged pions produced in the nuclear collisions of the beam with human tissue atoms. This work, for the first time, offers the upper bound of meson radiation dose in organic tissues due to secondary meson radiation in heavy-ion therapy. A model based on intranuclear collision has been used to follow in time the nuclear reaction and to determine the secondary radiation due to the meson yield produced in the beam interaction with nuclei in the tissue-equivalent media and water. The multiplicity, energy spectrum, and angular distribution of these pions, as well as their decay products, have been calculated in different scenarios for the nuclear reaction mechanism. The results of the produced secondary meson particles has been used to estimate the energy deposited in tissue using a cylindrical phantom by a transport Monte Carlo simulation and we have concluded that these mesons contribute at most 0.1% of the total prescribed dose.

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