Article
Geochemistry & Geophysics
Alexandra Fogtmann-Schulz, Sabrina G. K. Kudsk, Florian Adolphi, Christoffer Karoff, Mads F. Knudsen, Neil J. Loader, Raimund Muscheler, Pernille L. K. Trant, Stine M. Ostbo, Jesper Olsen
Summary: This study compared two methods for extracting a-cellulose from wood and found the most optimal method for high-precision radiocarbon analysis. The use of HCl acid for delignification was determined to be the most effective for pretreatment of tree rings at AARAMS.
Article
Geochemistry & Geophysics
Alexandra Fogtmann-Schulz, Claudia Baittinger, Christoffer Karoff, Jesper Olsen, Mads F. Knudsen
Summary: A new biennial record of radiocarbon measured in Danish oak covering the years 1251-1378 CE shows changes in the Hale and Schwabe solar cycles during the Wolf Minimum. The record's spectral analysis revealed peaks at 27 and 9.1 years, suggesting alterations in these cycles, but further research is needed to confirm these findings. The study also reconstructed the solar modulation function indicating a periodicity of approximately 9 years preceding the Wolf Minimum.
Article
Geochemistry & Geophysics
Martin Seiler, Pieter M. Grootes, Helene Svarva, Marie-Josee Nadeau
Summary: Atmospheric CO2 samples collected since the 1960s have been stored as CaCO3 in glass containers. The study investigated whether the stored samples can still be used for new measurements of atmospheric radiocarbon content and whether they have been contaminated. Various methods were attempted to clean the carbonate and release CO2 for remeasurements. The results showed significant changes in C-14 content for samples before 1970, indicating contamination during storage, and later samples from the 1970s showed lower contamination but still had added uncertainty, making them unreliable.
Article
Environmental Sciences
Zsofi Sajtos, Tamas Varga, Zita Gajdos, Petra Burik, Mate Csontos, Zsuzsa Lisztes-Szabo, A. J. Timothy Jull, Mihaly Molnar, Edina Baranyai
Summary: This paper presents the time-dependent elemental composition and AMS radiocarbon dating results of different types of honey samples collected between 1985 and 2018. The study indicates that honey samples can provide valuable environmental information, but there are random offsets in radiocarbon activity among different types of honey samples. The research shows that some honey samples may contain non-photosynthetic carbon, suggesting that further investigation is needed for environmental reconstruction using honey products.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Daniel E. Karig, Chase G. Mayers, Cassandra J. Wattenburger, John Southon
Summary: To avoid potential contamination from fungal hyphae associated with tree roots near the samples, it is recommended to choose sampling sites far from trees or to analyze the lignin component of the samples.
Article
Geochemistry & Geophysics
Corina Solis, Efrain Chavez, Arcadio Huerta, Maria Esther Ortiz, Alberto Alcantara, Maria Rodriguez-Ceja, Miguel Angel Martinez Carrillo
Summary: Augusto Moreno established the first radiocarbon laboratory in Mexico in the 1950s, but it wasn't until 2003 that C-14 measurement with AMS technology was achieved. By 2013, with advancements in AMS technology and sample preparation equipment, and support from UNAM and CONACYT, the Mexican AMS Laboratory LEMA became a reality.
Article
Geochemistry & Geophysics
Turhan Dogan, Erhan Ilkmen, Furkan Kulak
Summary: This article describes the process of the National 1MV Accelerator Mass Spectrometry (AMS) Laboratory in Turkey offering radiocarbon (C-14) analysis service internationally. The laboratory provides services including sample evaluation, preparation, measurement, and consultancy. The laboratory also has systems for CO2 conversion and a 1MV UAMS NEC Pelletron system for natural level C-14 samples. In addition to commercial activities, the laboratory can contribute to research projects.
Article
Geochemistry & Geophysics
Fatima Pawelczyk, Irka Hajdas, Gino Caspari, Jegor Blochin, Timur Sadykov
Summary: The study conducted comparative research on the preparation methods of human and animal bones as well as wooden remains from the Tunnug 1 site in the Tuva Republic. The results confirmed a highly consistent chronology of the sites, centered at 200-400 CE, but also highlighted issues with dating poorly preserved bones and wood.
Article
Biotechnology & Applied Microbiology
Youfen Qian, Tongzhou Gan, Sahib Zada, Yoko Katayama, Ji-Dong Gu
Summary: This study reveals the dissolution and loss of CaCO3 in stone as it is exposed to the environment, resulting in increased porosity and microbial growth. The difference in CaCO3 content between fresh and weathered stone demonstrates the connection between mineral dissolution reactions and microbial catalysis. This alteration of stone properties is critical for colonization and development of microbial communities.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2022)
Article
Instruments & Instrumentation
Mirei Takeyama, Toru Moriya, Hisako Saitoh, Hiroko Miyahara, Fusa Miyake, Motonari Ohyama, Rimi Sato, Rie Shitara, Hirohisa Sakurai, Fuyuki Tokanai
Summary: In 2009, Yamagata University introduced a compact 14C accelerator mass spectrometry (YU-AMS) system and an automated graphitization line. The YU-AMS system utilized a 0.5 MV pelletron accelerator (1.5SDH-1) developed by National Electrostatics Corporation (NEC). In 2014, an additional automated graphitization line and ion source were added to the YU-AMS system. Since 2010, approximately 2,000 samples have been measured annually using this system. The long-term stability of the system from 2010 to 2021 was assessed by measuring standard samples (IAEA-C6 and IAEA-C7) graphitized by the automated graphitization line.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Geochemistry & Geophysics
Laura Tassoni, Bernd Kromer, Ronny Friedrich, Lukas Wacker, Maurizio Cattani, Michael Friedrich, Dragana Palecek, Enrico Pelloni, Kehua Peng, Michael Eric Thomas, Sahra Talamo
Summary: Nowadays, radiocarbon laboratories can effectively prevent contamination during organic sample pretreatment, but there is still a risk of contamination during the storage of graphite. A test on archaeological samples found that proper packaging in tight metal cans and sealed vacuum bags can help avoid contamination during shipment and storage. Close cooperation between the chemistry laboratory and AMS facilities, high standards in contamination removal, and efficient measurement planning are crucial for obtaining reliable C-14 ages.
Article
Geochemistry & Geophysics
Francisco Antonio Balcorta Yepez, Montserrat Alavez Ortuzar, Zulema Berenice Flores Montes de Oca, Miguel Angel Martinez-Carrillo, Corina Solis, Maria Rodriguez-Ceja, Maria Esther Ortiz
Summary: The Mexico City Basin has had exceptional plant and animal diversity since ancient times due to its varied orography and benign climate, attracting diverse human groups and hiding a rich and varied cultural heritage underground. The Archaeological Rescue Department works to preserve cultural heritage, review archaeological studies, and expand archaeological information with new findings in the basin.
Article
Instruments & Instrumentation
Katerina Pachnerova Brabcova, Pavel Kundrat, Marketa Petrova, Tomas Krofta, Vaclav Suchy, Vojtech Valasek, David John, Petr Kozlovcev, Kristyna Kotkova, Anna Fialova, Jan Valek, Ivo Svetlik, Pavel P. Povinec
Summary: Radiocarbon dating of materials from a medieval castle revealed different ages of charcoals and wood, emphasizing the importance of collecting a large enough sample set.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2022)
Article
Geochemistry & Geophysics
A. Ginter, P. Moska, G. Poreba, K. Tudyka, A. Szymak, G. Szczurek
Summary: Brzezie in the Pleszew region is an important archaeological site, with continuous research conducted since the discovery of gold artifacts dating back to the 3rd period of the Bronze Age in 1876. Recent years have seen further excavation and extensive dating research, providing insights into the necropolis and its chronology.
Review
Geochemistry & Geophysics
L. Beck, I Caffy, E. Delque-Kolic, J-p Dumoulin, C. Goulas, S. Hain, C. Moreau, M. Perron, V Setti, M. Sieudat, B. Thellier
Summary: In 2001, five French public organizations signed an agreement to purchase a new accelerator mass spectrometer for radiocarbon dating services. The Laboratoire de Mesure du Carbone 14 (LMC14) was established in Saclay, France, and joined the Laboratoire des Sciences du Climat et de l'Environnement in 2015. The LMC14 has been a member of the IAEA Collaborating Centre Atoms for Heritage since 2021.
