Determination of stable isotope ratios using nuclear reaction analysis coupled with a particle-gamma coincidence method

Autor(es):Mostrar menos -

Allegro, Paula Rangel Pestana ^[1] ; Rizzutto, Marcia de Almeida ^[1] ; Added, Nemitala ^[1] ; Aguiar, Vitor angelo Paulino de ^[1] ; Toufen, Dennis Lozano ^[2] ; Macchione, Eduardo Luiz Augusto ^[1] ; Medina, Nilberto Heder ^[1] ; Ribas, Roberto Vicencotto ^[1] ; Oliveira, Jose Roberto Brandao de ^[1] ; Escudeiro, Rafael ^[1] ; Alcantara-Nunez, Juan Antonio ^[1] ; Curado, Jessica Fleury ^[3] ; Scarduelli, Valdir Brunetti ^[1] ; Zagatto, Vinicius Antonio Bocaline ^{[1, 4]} ; Rodrigues, Cleber Lima ^[1] ; Tabacniks, Manfredo Harri ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil

^[2] Fed Inst Educ Sci & Technol Sao Paulo IFSP, BR-07115000 Guarulhos, SP - Brazil

^[3] Univ Ctr FEI, Phys Dept, BR-09850901 Sao Bernardo Do Campo, SP - Brazil

^[4] Fluminense Fed Univ UFF, Phys Inst, BR-24210340 Niteroi, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 36, n. 1, p. 120-132, JAN 1 2021.
• Citações Web of Science: 0

Resumo

A non-destructive standard-free analytical method of obtaining stable isotope ratios in materials using nuclear reactions excited by an 11.75 MeV proton beam is demonstrated for a special Cu-63/Cu-65 target characterized traceably by Rutherford backscattering spectrometry (using 2.2 MeV protons). The method is general and is capable of being a useful alternative to standard ICP-MS methods. Relatively high energy proton beams are required to excite multiple isotopes of most elements of interest, and the many resulting nuclear reaction products are filtered by coincidence methods to characterize the desired isotope ratios. Specifically: the use of particle-gamma coincidences permits identification of specific channels populated in the nuclear reaction and avoids or minimizes typical drawbacks of this method including high backgrounds and interfering reactions. The test Cu target was a sandwich of a natural Cu and an enriched Cu-65 foil, and particle-gamma coincidences were measured for the reactions Cu-63(p,pi gamma)[Cu-63,Ni-60] and the corresponding reactions for Cu-65 (where ``pi{''} represents the energetic charged particle reaction product: proton or alpha). Limitations of the method, and applications in cultural heritage and other fields are discussed. (AU)

• Processo FAPESP: 13/19976-8 - Caracterização de bens culturais através de técnicas não destrutivas com feixes iônicos
• Beneficiário: Paula Rangel Pestana Allegro
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado