Effect of the UV lighting for photo-transfer of the charges of radiation dosimeters
Carregando...
Data
Data de publicação
2024
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
INTERNATIONAL SYMPOSIA ON RADIATION PHYSICS, 19th
Exportar
Resumo
Some solid-state materials store energy in the form of trapped electronic charges, when they are
exposed to ionizing radiation. This energy can be measured when the stimulation of those charges occurs
and one way is the heating of the sample, in order to observe its luminescent signal by the
thermoluminescence (TL) technique. Another way to study the luminescence of these materials is by
means of the phototransferred thermoluminescence (PTTL) technique, that allows the observation of the
light-induced transfer of charges from one kind of trap to another [1-2]. The main objective of this work
was to study the TL and PTTL of radiation dosimeters in 60Co and UV beams, in order to apply these
dosimeters using an established photo-transfer procedure in high-dose dosimetry.
The luminescent responses of commercial LiF:Mg,Ti, CaF2:Dy, CaF2:Mn and CaSO4:Dy
dosimeters were studied according to this sequence: 1) TL after irradiation; 2) TL after irradiation and
post-irradiation thermal treatment (PITT); and 3) PTTL after irradiation, PITT and illumination. The
irradiations were performed using a 60Co source, and all the measurements were taken using the Risø
reader system, model TL/OSL-DA-20. The absorbed doses were: 0.7 Gy (LiF:Mg,Ti and CaSO4:Dy),
20 Gy (CaF2:Dy) and 50 Gy (CaF2:Mn), for the first step, and 5 Gy (LiF:Mg,Ti), 100 Gy (CaF2:Dy),
200 Gy (CaF2:Mn) and 25 Gy (CaSO4:Dy), for the second and third steps.
As results of the first step, TL emission maximum peaks were observed for all four materials at
about 250ºC (LiF:Mg,Ti), 300ºC (CaF2:Dy and CaSO4:Dy) and 385ºC (CaF2:Mn). After PITT, in the
second step of the experiments, the TL peaks arised at about 365ºC for LiF:Mg,Ti, and for the other
materials no peaks were observed. In the final step, after exposure to UV light, PTTL signals appeared
for LiF:Mg,Ti at 260ºC and 370ºC, for CaF2:Mn at 398ºC and for CaSO4:Dy at 200ºC; no PTTL was
observed for CaF2:Dy.
According to the results obtained, it was possible to study the occurrence of the phototransferrence
signal of the materials, present for LiF:Mg,Ti, CaF2:Mn and CaSO4:Dy. These data open the possibility
of applying these materials and the PTTL technique in high-dose dosimetry of gamma irradiators, with
applications in the industrial area.
Como referenciar
ANTONIO, P.L.; SILVA, A.M.B.; SILVEIRA, I.S.; CALDAS, L.V. Effect of the UV lighting for photo-transfer of the charges of radiation dosimeters: TL and PTTL responses. In: PESSANHA, SOFIA (ed.); MANSO, MARTA (ed.). In: INTERNATIONAL SYMPOSIA ON RADIATION PHYSICS, 19th, September 1-5, 2024, Lisbon, Portugal. Abstract... Lisbon: Universidade Nova de Lisboa - Faculdade de Ciências e Tecnologia, Lisboa, 2024. p. 74-74. Disponível em: https://repositorio.ipen.br/handle/123456789/48967. 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.