Improvements in the PIGE technique via gamma-ray angular distribution

Autor(es)

Pestana Allegro, Paula Rangel ^[1] ; Rizzutto, Marcia de Almeida ^[1] ; Medina, Nilberto Heder ^[1]

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 126, p. 287-295, MAY 2016.
• Citações Web of Science: 3

Resumo

Particle induced gamma-ray emission (PIGE) is an ion beam technique used for isotopic elemental analysis of materials, based on gamma-ray spectroscopy. In the traditional PIGE setup, the gamma-ray detector is positioned at the neutral angles 55 degrees or 125 degrees with respect to the beam direction in order to measure gamma-rays with different angular distributions. Although these angles permit measurements without an a-priori knowledge of the specific angular distributions, this choice is not efficient if one wants to identify a specific element since a longer acquisition time is needed. In this work, we propose to optimize the PIGE measurements by choosing the detector angle position due to the previous knowledge of the gamma-ray multipolarity and the nuclear reaction. We present the angular distribution calculations for the isotopes most frequently identified by PIGE analysis, specially in Cultural Heritage objects. Calculations demonstrate that a gain in the intensity up to 70% can be achieved allowing the elemental identification in shorter times. This result is promising and represents a more efficient alternative to perform PIGE measurements. (C) 2015 Elsevier B.V. All rights reserved. (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