Investigation of sacred art book using EDXRF technique
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2024
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ENCONTRO DE PRIMAVERA DA SOCIEDADE BRASILEIRA DE FISICA, 4.
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Until the end of the 1960s, it was common practice to give young people a Brazilian missal
book at their First Communion. This prayer book was a special gift to celebrate a holy day.
Usually, both the cover and the back cover were made of mother-of-pearl with a golden
geometric design, hard spine (leaf stitching) and golden edges (gold plated). First
Communion prayer books were small (120 x 75 mm) and profusely illustrated with many
sacred figures, many prayers and other commandments of the Catholic Church. Furthermore,
these books had a standard edition: they were published with 78 pages with an index on the
last page. As these prayer books were expensive (made of mother-of-pearl and gold), there
were faux editions with celluloid covers and bronze details. Currently, this devotional
Brazilian missal book is considered a work of sacred art. In this study, a First Communion
prayer book, printed in 1955 by Edition IDEC in Portuguese (120 x 75 mm), was investigated
using EDXRF technique for heritage appreciation. The measurements were performed using
an X-Ray Spectrometer (X-123 SDD model from Amptek®), with an Ag and Au X-Ray
targets. The characteristic fluorescent X- rays emitted from the samples were measured with
a Si Drift detector (25 mm2 x 500 μm) with Be window (12.5μm). The excitation conditions
were optimized at 30 kV and 15 μA and a counting time of 300 s. Calcium presents the major
elemental concentration (Ca 93%, Ni 4%, Fe 2%, Ti 1% and Zn 0.01%) on the front and back
covers, which indicates the presence of mother-of-pearl (CaCO3). The golden geometric
design and metallic detail (“shield-shaped” metal plate centered on the front cover) are
composed of a metallic alloy containing mostly gold and silver: Au (70%), Ag (13%), Cu
(7%) and traces of Zn (1%), Mn (1%) and Fe (0.1%). Results also indicate that the edges are
gold-plated (Au 93%, Cu 3%, Ag 2%, Ni 2%, Zn 0.012% and Fe 0.001%). These data can
aid in identification of forgeries and also contribute to technical art history of worship objects
in a country so influenced by Catholic faith, such as Brazil.
Como referenciar
ZAMBONI, CIBELE B.; SILVA, DALTON G.N. da; REDIGOLO, MARCELO M.; STANOJEV, MARCO; BOGNAR, MARTA L. Investigation of sacred art book using EDXRF technique. In: ENCONTRO DE PRIMAVERA DA SOCIEDADE BRASILEIRA DE FISICA, 4., 24-27 de setembro, 2024, Belo Horizonte, MG. Resumo... São Paulo, SP: Sociedade Brasileira de Física - SBF, 2024. Disponível em: https://repositorio.ipen.br/handle/123456789/49137. Acesso em: 20 Mar 2026.
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.