Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

OSL dosimetric properties and efficiency of Brazilian natural calcium fluoride pellets

Texto completo
Autor(es):
Malthez, Anna L. M. C. [1] ; Marczewska, Barbara [2] ; Ferreira, Felisberto [3] ; Umisedo, Nancy K. [4] ; Nowak, Tomasz [2] ; Bilski, Pawel [2] ; Yoshimura, Elisabeth M. [4]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Tecnol Fed Parana, Phys Acad Dept, Av Desembargador Westphalen 637, Bloco N, BR-80010110 Curitiba, PR - Brazil
[2] Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow - Poland
[3] Fed Inst Santa Catarina, BR-88075010 Florianopolis, SC - Brazil
[4] Univ Sao Paulo, Inst Phys, Rua Matao 1371, BR-05508090 Sao Paulo - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Applied Radiation and Isotopes; v. 135, p. 166-170, MAY 2018.
Citações Web of Science: 1
Resumo

Calcium fluoride (CaF2), in both natural and synthetic forms, has been exhaustively studied and explored as thermoluminescent (TL) detector. However its sensitivity to ambient light points to the applicability of CaF2 as OSL (Optically Stimulated Luminescence) detector, increasing the research about its luminescent properties. Although some properties to employ CaF2 detectors with OSL technique have been already demonstrated, there is a lack of some essential information as the OSL response to different types and energy of ionizing radiation. In order to extend the use of Brazilian natural CaF2 with OSL technique, we evaluated the efficiency and dosimetric properties of cold pressed CaF2:NaCl pellets. The CaF2 detectors presented good reproducibility and negligible fading of the signal over one month after irradiation. The dose response using OSL, TL and residual u, showed linear behavior for different radiation beams (protons, photons and alpha and beta particles), being equivalent to the results obtained with BeO and MTS (LiF) detectors through OSL and TL technique respectively. Moreover, differences were observed in OSL efficiency according the beam type and energy; CaF2 detectors presented a higher OSL and TL sensitivities to protons, photons and beta particles than to alpha particles. The energy response to photons obtained using OSL and residual TL intensities present an over response at lower photon energy similar to TL energy response. In addition, differences in the OSL curve shapes were observed according to radiation type and energy, pointing to the possibility of applying this material in mixed radiation fields and to estimate average LET (Linear Energy Transfer). (AU)

Processo FAPESP: 12/13534-0 - Estudo da luminescência opticamente estimulada em BeO e CaF2
Beneficiário:Felisberto Alves Ferreira Junior
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 10/16437-0 - Caracterização e aplicações de materiais dosimétricos utilizando a luminescência opticamente estimulada e técnicas complementares
Beneficiário:Linda Viola Ehlin Caldas
Linha de fomento: Auxílio à Pesquisa - Temático