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Archeologické rozhledy
Radiouhlíkové datování je etablovanou metodou, která pomáhá určit absolutní stáří archeologických... more Radiouhlíkové datování je etablovanou metodou, která pomáhá určit absolutní stáří archeologických nálezů. Tento tematický přehled prezentuje základní principy radiouhlíkové metody, předpoklady pro výběr vzorků z archeologických situací, způsob zacházení se vzorky před zasláním do radiouhlíkové laboratoře, laboratorní postupy úpravy vzorků, průběh AMS měření a kalibraci výsledků. Dále jsou vysvětleny faktory, které omezují výsledky radiouhlíkového datování, zejména radiouhlíková plata a rezervoárový efekt, a jak lze jejich vliv rozpoznat a případně eliminovat. Hlavním cílem článku je kriticky zhodnonit aplikaci radiouhlíkové metody na méně obvyklé archeologické vzorky (lipidy uchované v pórech keramiky, spálené kosti, zubní kámen, železné předměty a železné strusky, malta, pylové a fytolitové koncentráty vyextrahované ze sedimentů či půd), jejichž datace otevírá nové možnosti pro chronologické ukotvení přírodních i kulturních procesů a událostí v minulosti.
Radiocarbon
The fifth season of excavations of Oponice Castle in 2020 was located in the lower castle’s court... more The fifth season of excavations of Oponice Castle in 2020 was located in the lower castle’s courtyard. The research led to discovery of an original clay floor being heavily burned with charred plank and a rectangular stone-brick construction. The construction has collapsed upper part with a fallen low brick arch. The whole area was covered with numerous stove tiles and one clay mold for the production of stove tiles. The construction was identified as a pottery kiln dated to the second half of the 16th until the first half of the 17th century AD by the findings from excavated layer identified to the kiln destruction. Also, written sources mention a large fire in 1645 which destroyed the castle. The aim of this article is to use different methods of dating and refine the chronology of the context through microarchaeology and Bayesian modeling. For these purposes different types of samples were collected. The sampling focused on site formation process determination of pottery kiln use...
Radiocarbon
Dating organic inclusions in mortars such as charcoals is a useful alternative or complementary m... more Dating organic inclusions in mortars such as charcoals is a useful alternative or complementary method to dating mortars themselves, helping to estimate the building age. To assess the limitations of this dating approach, organic inclusions were searched for in surface mortar layers of six early to late medieval buildings in the Czech Republic with relatively well-known age. Altogether, 123 samples were found. About 80% were successfully radiocarbon (14C) dated. However, only 66% originated from wood relatively young when used in lime burning. To judge which samples are relevant to the actual building date, sufficient statistics is crucial. We recommend dating at least 5–10 samples, i.e., collecting 6–12 samples, for a site with uncomplicated building history, or per building phase. Otherwise, unrealistically old or young dates might be obtained. With the recommended statistics, inclusion-based dating provides building ages with uncertainty of 50–100 years.
Chemické listy
The history of radiocarbon dating is defined by several major milestones – its own discovery, the... more The history of radiocarbon dating is defined by several major milestones – its own discovery, the forced revision of basic principles, the discovery of accelerator mass spectrometry and anthropogenic influences. The current capabilities of the method are demonstrated through two forensic applications in the field of crime against humans and endangered species.
Radiocarbon
ABSTRACTRýzmburk Castle is one of the largest and most important medieval castles in Bohemia, doc... more ABSTRACTRýzmburk Castle is one of the largest and most important medieval castles in Bohemia, documented since 1250 AD. Its North tower is assumed to be built in 1260–1300 AD. To test this assumption, the surface layers of mortar were inspected for the presence of charcoals suitable for radiocarbon dating, and 10 charcoals were found. The charcoals probably originated from wood used for lime burning. The results of radiocarbon dating using accelerator mass spectrometry agree with the historical estimation. Single post-1287 sample indicates that the building date might be refined to 1287–1300 AD.
Chemicke Listy, Feb 15, 2023
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Journal of Radioanalytical and Nuclear Chemistry
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Radiocarbon dating of charcoals and small pieces of wood collected from mortar in the torso of be... more Radiocarbon dating of charcoals and small pieces of wood collected from mortar in the torso of bergfried and buttress of the medieval Pyšolec castle was performed using accelerator mass spectrometers. Altogether, 37 samples were collected, of which 33 samples passed pre-processing criteria and chemical treatment and were dated. Two of them were Palaeolithic charcoals of likely sedimentary origin, one wood sample corresponded to a younger intrusion, six represented ‘old wood’ likely aged about 200 years when built in, and 24 originated from ‘young wood’ presumably not older than 50 years at the time of building. This highlights the need to collect large enough sample set when dating architectural remains using charcoals or wood splinters. As a rule of thumb, collecting at least 10 samples is recommended; otherwise, the dating might not be feasible at all or may yield unrealistically old estimates, by as much as 200 years for medieval castles.
Archeologické rozhledy
Radiouhlíkové datování je etablovanou metodou, která pomáhá určit absolutní stáří archeologických... more Radiouhlíkové datování je etablovanou metodou, která pomáhá určit absolutní stáří archeologických nálezů. Tento tematický přehled prezentuje základní principy radiouhlíkové metody, předpoklady pro výběr vzorků z archeologických situací, způsob zacházení se vzorky před zasláním do radiouhlíkové laboratoře, laboratorní postupy úpravy vzorků, průběh AMS měření a kalibraci výsledků. Dále jsou vysvětleny faktory, které omezují výsledky radiouhlíkového datování, zejména radiouhlíková plata a rezervoárový efekt, a jak lze jejich vliv rozpoznat a případně eliminovat. Hlavním cílem článku je kriticky zhodnonit aplikaci radiouhlíkové metody na méně obvyklé archeologické vzorky (lipidy uchované v pórech keramiky, spálené kosti, zubní kámen, železné předměty a železné strusky, malta, pylové a fytolitové koncentráty vyextrahované ze sedimentů či půd), jejichž datace otevírá nové možnosti pro chronologické ukotvení přírodních i kulturních procesů a událostí v minulosti.
Radiocarbon
The fifth season of excavations of Oponice Castle in 2020 was located in the lower castle’s court... more The fifth season of excavations of Oponice Castle in 2020 was located in the lower castle’s courtyard. The research led to discovery of an original clay floor being heavily burned with charred plank and a rectangular stone-brick construction. The construction has collapsed upper part with a fallen low brick arch. The whole area was covered with numerous stove tiles and one clay mold for the production of stove tiles. The construction was identified as a pottery kiln dated to the second half of the 16th until the first half of the 17th century AD by the findings from excavated layer identified to the kiln destruction. Also, written sources mention a large fire in 1645 which destroyed the castle. The aim of this article is to use different methods of dating and refine the chronology of the context through microarchaeology and Bayesian modeling. For these purposes different types of samples were collected. The sampling focused on site formation process determination of pottery kiln use...
Radiocarbon
Dating organic inclusions in mortars such as charcoals is a useful alternative or complementary m... more Dating organic inclusions in mortars such as charcoals is a useful alternative or complementary method to dating mortars themselves, helping to estimate the building age. To assess the limitations of this dating approach, organic inclusions were searched for in surface mortar layers of six early to late medieval buildings in the Czech Republic with relatively well-known age. Altogether, 123 samples were found. About 80% were successfully radiocarbon (14C) dated. However, only 66% originated from wood relatively young when used in lime burning. To judge which samples are relevant to the actual building date, sufficient statistics is crucial. We recommend dating at least 5–10 samples, i.e., collecting 6–12 samples, for a site with uncomplicated building history, or per building phase. Otherwise, unrealistically old or young dates might be obtained. With the recommended statistics, inclusion-based dating provides building ages with uncertainty of 50–100 years.
Chemické listy
The history of radiocarbon dating is defined by several major milestones – its own discovery, the... more The history of radiocarbon dating is defined by several major milestones – its own discovery, the forced revision of basic principles, the discovery of accelerator mass spectrometry and anthropogenic influences. The current capabilities of the method are demonstrated through two forensic applications in the field of crime against humans and endangered species.
Radiocarbon
ABSTRACTRýzmburk Castle is one of the largest and most important medieval castles in Bohemia, doc... more ABSTRACTRýzmburk Castle is one of the largest and most important medieval castles in Bohemia, documented since 1250 AD. Its North tower is assumed to be built in 1260–1300 AD. To test this assumption, the surface layers of mortar were inspected for the presence of charcoals suitable for radiocarbon dating, and 10 charcoals were found. The charcoals probably originated from wood used for lime burning. The results of radiocarbon dating using accelerator mass spectrometry agree with the historical estimation. Single post-1287 sample indicates that the building date might be refined to 1287–1300 AD.
Chemicke Listy, Feb 15, 2023
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Journal of Radioanalytical and Nuclear Chemistry
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Radiocarbon dating of charcoals and small pieces of wood collected from mortar in the torso of be... more Radiocarbon dating of charcoals and small pieces of wood collected from mortar in the torso of bergfried and buttress of the medieval Pyšolec castle was performed using accelerator mass spectrometers. Altogether, 37 samples were collected, of which 33 samples passed pre-processing criteria and chemical treatment and were dated. Two of them were Palaeolithic charcoals of likely sedimentary origin, one wood sample corresponded to a younger intrusion, six represented ‘old wood’ likely aged about 200 years when built in, and 24 originated from ‘young wood’ presumably not older than 50 years at the time of building. This highlights the need to collect large enough sample set when dating architectural remains using charcoals or wood splinters. As a rule of thumb, collecting at least 10 samples is recommended; otherwise, the dating might not be feasible at all or may yield unrealistically old estimates, by as much as 200 years for medieval castles.