I Hajdas

Biographic Data

ID26286
NAMEI Hajdas
GIVEN NAMESI
FAMILY NAMEHajdas
SIGNATUREHAJDAS I
AFFILIATIONSETH Zurich
ORCID0000-0003-2373-2725
VERIFIEDYes
TOTAL WORKS119
TOTAL CITATIONS4848
AUTHOR COUNT119
EDITOR COUNT0
FIRST PUBLICATION YEAR1996
LATEST PUBLICATION YEAR2026
H-INDEX17

  • Effect of conservation treatments on radiocarbon ages of wood

    Open AccessI Hajdas, Monika Isler et al.ARTICLERadiocarbon2026

    The efficiency of the standard radiocarbon pretreatment in removing contamination from carbon introduced by wood conservation treatments was tested. Seven consolidated waterlogged wood samples from well-dated archaeological sites in Switzerland were chosen for preparation and AMS analysis. Conservation material included materials frequently used in the second half of the 20th century such as Arigal C, Polyethylene glycol, Ethanol-Ether, and sucro…

  • Tracing the influence of Western Mediterranean innovations in Neolithic Europe through directly radiocarbon-dated naked wheat (Triticum aestivum/durum/turgidum)

    Open AccessGuillem Salvador-Baiges, I Hajdas et al.ARTICLEJournal of Archaeological Science…2026

    The dispersal of crops offers a powerful lens through which to investigate prehistoric mobility, interaction, and adaptation. This study examines the spatiotemporal distribution of naked wheat across Europe during the Neolithic using a dataset of 116 directly dated naked wheat remains from 58 archaeological sites (ca. 6000–2400 cal BCE). Dates were calibrated and analysed through summed probability distributions, composite Kernel Density Estimati…

  • A new 14 C sample treatment laboratory at the Maria Curie-Skłodowska University, Lublin, PL

    Open AccessKatarzyna Burdzy, I Hajdas et al.ARTICLERadiocarbon2026

    The accuracy and precision of radiocarbon dating largely depend on the quality of sample preparation prior to measurement. Proper selection of material, identification of potential contaminants, and application of appropriate purification procedures are the basis of reliable 14 C analyses. Modern preparation laboratories not only support the process of obtaining reliable results but also play a key role in integrating the scientific community and…

  • Radiocarbon dating of mortars from monastery hill in Tyniec, Poland

    Open AccessD Michalska, I Hajdas et al.ARTICLERadiocarbon2026

    The Benedictine Abbey in Tyniec is the oldest existing monastery in Poland (11th cent. AD). The historic walls of the Monastery have survived to this day and crown the limestone hill on the Vistula River. The geological structure of the surrounding area is reflected in the composition of the mortars. In vicinity of Tyniec one may observe outcrops of Upper Jurassic limestones represented by two facies: bedded limestones with cherts and massive lim…

  • Evolution of an Early and Long-Lasting Iron Smelting Technique at Didé West 1, Falémé Valley, Eastern Senegal

    Open AccessMélissa Morel, Pierre Lamotte et al.ARTICLEAfrican Archaeological Review2026References: 16

  • Radiocarbon ages of the Iceman—Reopening a jar with the frozen tissue stored at the ETH laboratory

    Open AccessI Hajdas, Hajdas Irka et al.ARTICLERadiocarbon2026References: 15

    We report the results of radiocarbon dating performed at the ETH laboratory on soft tissue of the mummified body found in September 1991 on the Hauslabjoch in the Ötztaler Alps (near the Similaun Mountain), South Tyrol. Over the past three decades, additional analyses of the sample, which had been stored frozen in a glass jar, have improved the precision of the first published radiocarbon ages. The frozen jar and the story of a mummified body fou…

  • Radiocarbon dating of the Church of St. Margaret of Antioch in Kopčany (Slovakia)

    Open AccessPavel P Povinec, I Kontuľ et al.ARTICLERadiocarbon2025

    An international consortium of radiocarbon laboratories has established the origin of the Church of St. Margaret of Antioch in Kopčany (Slovakia), because its age was not well known from previous investigations. In total, 13 samples of charcoal, wood, mortar, and plaster were analyzed. The 14 C results obtained from the different laboratories, as well as between the different sample types, were in good agreement. Resulting the final 14 C calibrat…

  • Integrating Material Analysis, Radiocarbon Dating, and Technical Examination in the Dating and Provenance Study of a Copy of Raphael’s “The Great Holy Family of Francis I”

    Open AccessEster S B Ferreira, Christian Hoffmann et al.ARTICLEHeritage2025Cited by: 1

    In 2016, five fragments from a copy of “The Great Holy Family of Francis I” were brought to the Cologne Institute of Conservation Sciences (CICS) for research and conserva-tion/restoration. A comprehensive technical and material analysis was carried out to as-sist provenance studies. From the analysis of pigments, binder, additives, and canvas fi-bres alongside radiocarbon dating of the lead white pigment, oil binder, and canvas sup-port, as well…

  • Mudbricks in Medieval West African Architecture

    Open AccessCéline Cervera, Éric Huysecom et al.ARTICLEJournal of African Archaeology2025References: 1

    The Djoutoubaya settlement in the Falémé Valley (Senegal), occupied from the 9th to 14th centuries, provides key insights into West African mudbrick architecture prior to the 16th century. This study examines Djoutoubaya’s architectural evolution, focusing on a mudbrick complex dating to the 13th century. The presence of two distinct brick types – hand-modeled “loaf-shaped” and molded plano-convex – demonstrates diverse construction practices, wh…

  • Fading of the 14 C bomb peak – students’ project to observe the Suess effect

    Open AccessI Hajdas, André Albrecht et al.ARTICLERadiocarbon2025References: 43

    The natural variability of atmospheric 14 C has been significantly altered by anthropogenic activities linked to technological advancements and energy consumption over the past two and a half centuries. The Suess effect, a consequence of the combustion of old carbon (fossil fuels) since the mid-18th century and the bomb peak from the mid-20th century’s thermonuclear tests, has obscured the natural 14 C signal in the atmosphere. This study present…

  • Holocene multi-proxy environmental reconstruction of a tundra lake

    Open AccessRadosław Dobrowolski, Piotr Zagórski et al.ARTICLEThe Holocene2025Cited by: 1References: 59

    Multi-proxy analyses of two twin sediment cores from the Reindeer Lake were performed to reconstruct the Holocene environmental conditions in this eastern branch of the Bellsund region (Western Spitsbergen). A continuous Holocene lacustrine sediment sequence record was documented, with the dominance of a single algal species, Pediastrum orientale . The basal sediment was AMS 14 C-dated between 8.4 and 8.2 ka cal BP. The results of our study, indi…

  • New and old coral radiocarbon records revisited for the subtropical and tropical Atlantic Ocean

    Open AccessKristine L Delong, K Halimeda Kilbourne et al.ARTICLERadiocarbon2025

    Ocean radiocarbon ( 14 C) is a proxy for air-sea exchange, vertical and horizontal mixing, and water mass identification. Here, we present five pre- to post-bomb coral Δ 14 C records from West Flower Garden Bank and Santiaguillo reefs in the Gulf of Mexico, Boca de Medio, and Isla Tortuga near the Cariaco Basin north of Venezuela. To assess basin-wide Δ 14 C variability, we compiled the Atlantic Ocean reef-building surface coral Δ 14 C records (2…

  • Beginning of the circle? Revised chronologies for Flagstones and Alington Avenue, Dorchester, Dorset

    Open AccessSusan Greaney, I Hajdas et al.ARTICLEAntiquity2025Cited by: 1References: 20

    A shift towards constructing large circular monuments, including henges, during the Middle Neolithic of Britain and Ireland is exemplified in the monumental landscape of south-west England. Seventeen new radiocarbon dates for the Flagstones circular enclosure and the adjacent long enclosure of Alington Avenue, presented here, provide a chronology that is earlier than expected. Comparison with similar sites demonstrates that Flagstones was part of…

  • Radiocarbon Dating of Highly Degraded and Problematic Fossil Wood

    Open AccessMaksymilian Jędrzejowski, Danuta J Michczyńska et al.ARTICLERadiocarbon2024Cited by: 2References: 58

    This paper compares various wood pretreatment methods for highly degraded, and problematic fossil wood extracted from the opencast Szczerców site of the Bełchatów Lignite Mine in Central Poland. The study evaluates the pretreatment methods using both large samples (55–255 g, referred to as series A) and small samples (36–150 mg, referred to as series B). Additionally, all preparation methods were applied to medium-sized samples (approximately 3 g…

  • The Dating of Dolomitic Mortars With Uncertain Chronology From Müstair Monastery

    Open AccessMarta Caroselli, I Hajdas et al.ARTICLERadiocarbon2024Cited by: 1References: 16

    To obtain scientific data regarding the chronology of archaeological structures, lime mortar radiocarbon dating has often demonstrated to be a decisive method. However, knowing the specific chemical-mineralogical characteristics of mortars can help when preparing samples or interpreting results. Among other issues, the dating of magnesian mortars can be particularly difficult because of the combined slaking, setting and hardening reactions of the…

  • Sample Selection, Characterization and Choice of Treatment for Accurate Radiocarbon Analysis—insights From the Eth Laboratory

    Open AccessI Hajdas, Giulia Guidobaldi et al.ARTICLERadiocarbon2024Cited by: 1References: 58

    Accurate radiocarbon ( 14 C) analysis depends on a successful carbon separation relevant to the studied object. The process of 14 C dating involves the following steps: characterization and sample choice, sample treatment, measurements, and evaluation of the results. Here, we provide an overview of conventional approaches to macromolecular samples and address specific issues such as detecting and removing contamination with roots, dolomite, and c…

  • An archaeobotanical and stable isotope approach to changing agricultural practices in the NW Mediterranean region around 4000 BC

    Open AccessF Antolín, Stefanie Jacomet et al.ARTICLEThe Holocene2023References: 15

    It has recently been observed, that a change in the crop spectrum happened during the so-called Middle Neolithic in France at ca. 4000 BC. An agricultural system based on free-threshing cereals (naked wheat and naked barley) seems to shift to one based on glume wheats. This is a major change for traditional farmers and this paper aims to shed light on its possible causes. Here we describe the results of new investigations in a key area for the un…

  • Water and landscape management for 3,000 years in a mid-mountain area

    Open AccessAndré‐Marie Dendievel, Hervé Cubizolle et al.ARTICLEVegetation History and…2023References: 5

  • New research on crop diversity of the early farmers in southeastern Europe (ca. 6400 − 5700 bce)

    Open AccessAmalia Sabanov, Raül Soteras et al.ARTICLEVegetation History and…2023Cited by: 4References: 7

    Pelagonia is a mountain valley in North Macedonia that was densely occupied by early farming communities in the second half of the 7th and early 6th millennium bce . Archaeobotanical analysis is being done on material from three sites there, Vrbjanska Čuka, Veluška Tumba and Vlaho. This paper presents the results of archaeobotanical analyses of remains from Pelagonia, which represent some of the oldest directly dated remains of cereals and pulses…

  • Towards a Radiocarbon-Based Chronology of Urban Northern Mesopotamia in the Early to Mid-Second Millennium Bc

    Open AccessLyndelle Webster, Alexia Smith et al.ARTICLERadiocarbon2023Cited by: 1References: 27

    Radiocarbon ( 14 C) data for 2nd millennium BC urban sites in northern Mesopotamia have been lacking until recently. This article presents a preliminary dataset and Bayesian model addressing the Middle and early Late Bronze Age (Old Babylonian and pre/early Mittani) strata of Kurd Qaburstan—one of the largest archaeological sites on the Erbil plain of Iraqi Kurdistan. The results place the large, densely occupied and fortified Middle Bronze Age c…

  • Radiocarbon Dating of Manuscripts Kept in the Central Library of the University of Tehran

    Open AccessAli Aghaei, Faranak Bahrololoumi et al.ARTICLERadiocarbon2023References: 26

    This article discusses radiocarbon dating results of documents preserved at the Central Library of the University of Tehran (hereafter, CLUT) as part of the project “Irankoran.” The paper adds new evidence to an ongoing campaign of dating Qurʾāns and Oriental manuscripts by the Corpus Coranicum Project. The dated manuscripts include one kūfī fragment of the Qurʾān on parchment (no. 10950) and a selection of Islamic and Persian manuscripts, all fr…

  • Intercomparison Exercise on Fuel Samples for Determination of Biocontent Ratio by 14 C Accelerator Mass Spectrometry

    Open AccessTamás Vargas, I Hajdas et al.ARTICLERadiocarbon2023Cited by: 1References: 36

    The method of determining the biobased carbon content in liquid fuel samples is standardized, but different laboratories use different protocols during sample preparation and perform the measurements using different machines. The accelerator mass spectrometry (AMS) laboratories use different combustion, preparation, and graphitization methods for the graphite production for the spectrometric measurements. As a result, the intercomparison between …

  • Na wschodzie bez zmian? W sprawie chronologii absolutnej ceramiki z obszaru pogranicza polsko-ruskiego. Gródek, stanowisko nr 35

    Open AccessMichał Auch, Tomasz Dzieńkowski et al.ARTICLEArcheologia Polski2023References: 2

    W artykule zaprezentowano wyniki datowania radiowęglowego wczesnośredniowiecznej ceramiki z dwóch pieców odkrytych na stanowisku nr 35 w Gródku nad Bugiem. „Tradycyjne” datowanie wskazuje na XI w., podczas gdy uzyskane daty 14C są o około 150 lat starsze. Stratygraficzny związek próbek i ceramiki nie budzi wątpliwości, należy zatem omawiane wyniki potraktować jako głos w dyskusji dotyczącej różnych rytmów przemian warsztatu garncarskiego na ziemi…

  • The Śnieżka peatland as a candidate Global boundary Stratotype Section and Point for the Anthropocene series

    Open AccessBarbara Fiałkiewicz-Kozieł, Edyta Łokas et al.ARTICLEThe Anthropocene Review2023Cited by: 5References: 107

    The subalpine, atmospherically fed Śnieżka peatland, located in the Polish part of the Sudetes, is one of the nominated candidates for the GSSP of the Anthropocene. Data from two profiles, Sn1 (2012) and Sn0 (2020), from this site are critical for distinguishing the proposed epoch, while an additional core Sn2 is presented to support main evidence. The Sn0 archive contains a wide array of critical markers such as plutonium (Pu), radiocarbon (F14C…

  • The Flower Garden Banks Siderastrea siderea coral as a candidate Global boundary Stratotype Section and Point for the Anthropocene series

    Open AccessKristine L Delong, Kylie Palmer et al.ARTICLEThe Anthropocene Review2023Cited by: 1References: 77

    The proposed Anthropocene Global Boundary Stratotype Section and Point (GSSP) candidate site of West Flower Garden Bank (27.8762°N, 93.8147°W) is an open ocean location in the Gulf of Mexico with a submerged coral reef and few direct human impacts. Corals contain highly accurate and precise (<±1 year) internal chronologies, similar to tree rings, and their exoskeletons are formed of aragonite and can be preserved in the rock record. Here we prese…