Resumen

LEYVA FABELO, Antonio et al. Electron and positron contributions to the displacement per atom profile in bulk multi-walled carbon nanotube material irradiated with gamma rays . Nucleus [online]. 2013, n.53, pp. 5-9. ISSN 0864-084X.

The electron and positron contributions to the effective atom displacement cross-section in multi-walled carbon nanotube bulk materials exposed to the gamma rays were calculated. The physical properties and the displacement threshold energy value reported in literature for this material were taken into account. Then, using the mathematical simulation of photon and particle transport in matter, the electron and positron energy flux distributions within the irradiated object were also calculated. Finally, considering both results, the atom displacement damage profiles inside the analyzed bulk carbon nanotube material were determined. The individual contribution from each type of secondary particles generated by the photon interactions was specified. An increasing behavior of the displacement cross-sections for all the studied particles energy range was observed. The particles minimum kinetic energy values that make probabilistically possible the single and multiple atom displacement processes were determined. The positrons contribution importance to the total number of point defects generated during the interaction of gamma rays with the studied materials was confirmed.

Palabras clave : carbon nanotubes; gamma radiation; atomic displacements; cross section; monte carlo method; simulation.

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