A comparison between neutron-fluence measurements using metal-activation monitors and standard glasses calibrated via thin uranium-fission monitors and via eta q method

Autor(es)

Curvo, E. A. C. ^[1] ; Jonckheere, R. ^[2] ; Guedes, S. ^[3] ; Iunes, P. J. ^[3] ; Tello, C. A. ^[4] ; Hadler, J. C. ^[3] ; Unterricker, S. ^[5] ; Ratschbacher, L. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Mato Grosso, UFMT, Inst Fis, BR-78060900 Cuiaba, MT - Brazil

^[2] Tech Univ Bergakad Freiberg, Inst Geol, D-09599 Freiberg - Germany

^[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

^[4] Univ Estadual Paulista, Dept Fis Quim & Biol, BR-19060900 Presidente Prudente, SP - Brazil

^[5] Tech Univ Bergakad Freiberg, Inst Angew Phys, D-09596 Freiberg - Germany

• Tipo de documento: Artigo Científico
• Fonte: Radiation Measurements; v. 53-54, p. 38-44, JUN-JUL 2013.
• Citações Web of Science: 6

Resumo

The two fundamental approaches to fission-track dating involve either an explicit determination of the thermal neutron fluence (phi-method) or a calibration against age standards (zeta-method). The neutron fluence measurements are carried out with metal-activation monitors or with uranium-fission monitors, co-irradiated with the samples. Uranium-fission monitors consist of either a thin ``mono-atomic{''}) film, or a thick fission source (standard uranium glass) irradiated against a muscovite external track detector. In this work, different techniques for performing neutron-fluence measurements were compared: based on thin-film calibration, based on thick-source calibration, and based on gamma spectrometry of co-irradiated metal monitors (Au, Co). The results suggest that more experiments are needed to make all calibrations consistent, including new measurements of the length of etched induced tracks in mica. Also the standard glass calibration carried out with thin films should be confirmed with a greater number of calibrating irradiations. (c) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 05/01684-4 - Análise conjunta de traços de fissão em epídoto e apatita na caracterização geotermocronológica de uma região: aplicação na região de Brejuí - RN, Brasil
• Beneficiário: Eduardo Augusto Campos Curvo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado