Mass energy absorption coefficients and energy responses of magnesium tetraborate dosimeters for 0.02 MeV to 20 MeV photons using Monte Carlo simulations
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Applied Radiation and Isotopes
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Resumo
Thermoluminescence dosimeters containing boron, such as magnesium tetraborate (MgB4O7), are of interest
because of their very high sensitivity, near tissue-equivalent absorption coefficients, low cost, easy handling, and
very large linearity range for absorbed dose. Another important parameter that should be considered when
working with thermoluminescent dosimeter (TLD) is the mass energy absorption coefficient (μen/ρ), which is a
close approximation to the energy available for production of chemical, biological and other effects associated
with exposure to ionizing radiation, therefore important in estimating dose in medical and health physics. In this
study the mass energy absorption coefficients and energy responses of undoped and some doped magnesium
tetraborates were calculated by Monte Carlo N-particle transport code for a range of photon energies between
20 keV and 20 MeV. The calculated parameters for MgB4O7, MgB4O7:Dy and MgB4O7:Dy,Li were evaluated in
comparison with standard TLDs as Al2O3:C and TLD-100 (LiF: Mg, Ti) and ICRU tissue data. The influence of the
dopant concentration in the MgB4O7 matrix on the energy dependence of TLD was also investigated. The analyses
indicated a good agreement between the simulations and theoretical calculations. The μen/ρ and energy
dependence of the materials are higher in the low energy range (E < 100 keV), which is related to the high
probability of interaction between radiation and matter due to photoelectric absorption. With regard to the
influence of dysprosium concentration in the MgB4O7 matrix an increase in the energy dependence of MgB4O7
for higher concentrations of dopants was observed in the low energy range.
Como referenciar
SOUZA, LUIZA F.; SANTOS, WILLIAM S.; BELINATO, WALMIR; SILVA, ROGERIO M.V.; CALDAS, LINDA V.E.; SOUZA, DIVANIZIA N. Mass energy absorption coefficients and energy responses of magnesium tetraborate dosimeters for 0.02 MeV to 20 MeV photons using Monte Carlo simulations. Applied Radiation and Isotopes, v. 148, p. 232-239, 2019. DOI: 10.1016/j.apradiso.2019.04.015. Disponível em: http://repositorio.ipen.br/handle/123456789/30448. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
Assuntos
absorbed radiation doses; borates; boron; computerized simulation; concentration ratio; doped materials; energy absorption; energy dependence; icru; ionizing radiations; kev range; lithium fluorides; magnesium; magnesium compounds; mev range; monte carlo method; radiation protection; sensitivity; thermoluminescent dosemeters