Herbert Haas
Biographic Data
| ID | 3693965 |
|---|---|
| NAME | Herbert Haas |
| GIVEN NAMES | Herbert |
| FAMILY NAME | Haas |
| SIGNATURE | HAAS H |
| AFFILIATIONS | Desert Research Institute |
| VERIFIED | No |
| TOTAL WORKS | 28 |
| TOTAL CITATIONS | 166 |
| AUTHOR COUNT | 28 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1974 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 8 |
Radiocarbon Chronology of Paso Otero 1 in the Pampean Region of Argentina
Paso Otero 1, in the Pampas of Argentina, is a stratified, riverine site containing alluvium with a sequence of buried A-horizons and two guanaco bone beds. The site is the first-recorded guanaco kill/butchering locale for the Pampas and represents at least two events during different times. Bulk organic sediment samples were taken from the three buried A-horizons and the humates assayed to produce a chronology for the site and date the cultural …
Radiocarbon Dates from the Monumental Architecture at Chavín de Huántar, Perú
A chronology of middle Missouri Plains village sites
Differential Mortuary Treatment among the Andean Chinchorro Fishers: Social Inequalities or In Situ Regional Cultural Evolution
Radiocarbon Dates of Old and Middle Kingdom Monuments in Egypt
Between 1984 and 1995 over 450 organic samples were collected from monuments built during the Old and Middle Kingdoms. The most suitable samples were selected for dating. The purpose was to establish a radiocarbon chronology with samples from secure context and collected with the careful techniques required for 14 C samples. This chronology is compared to the historical chronology established by reconstructing written documentation
Calibration Technique for 14 C Data Clusters: Fitting Relative Chronologies onto Absolute Time Scales
Application of radiocarbon dating to a short chronology is often limited by the wide probability ranges of calibrated dates. These wide ranges are caused by multiple intersections of the 14 C age with the tree-ring curve. For a single unrelated 14 C date, each intersection presents a probable solution. When several dates on different events are available, identification of the most probable solution for each event is possible if one can obtain so…
First Radiocarbon Dates for San Josecito Cave, Nuevo León, México
Initial excavations (1935-1941) in San Josecito Cave, Nuevo León, México revealed a rich late Quaternary fossil fauna. The San Josecito Cave fauna was viewed as a single time-related entity despite the lack of 14 C dating. Renewed excavations (1990) recovered a series of 14 C samples related to the complex stratigraphy. Six 14 C dates show that the recently excavated deposits range in age between 45,000 and 27,000 yr B.P. These ages suggest that …
Conference Participants
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
Change of Calibration Parameters in Frequently Used Vials in Benzene Scintillation Counting
Scintillation counting vials used for counting synthesized benzene accumulate an inside coating which is insoluble in benzene. This coating reduces the photon transfer from the vial and lowers its observed background. Age calculations that include calibration data collected with other vials may be inaccurate if this effect is not considered. Frequent cleaning of the counting vials with strong acid solutions keeps the coating from accumulating. A …
Radiocarbon Updates
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
Participants
From the 14th International Radiocarbon Conference held in Tucson, AZ, May 20-24, 1991
Laboratories
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
Small Sample 14 C Dating by Liquid Scintillation Spectrometry
Small sample 14 C dating is tested using conventional as well as high-resolution low-level liquid scintillation (LS) spectrometers. Contrasted are the results obtained dating ∼25, 125 and 250mg of elemental carbon in standard size counting vials (3mL) and 0.3mL teflon and quartz vials. It is demonstrated that the improved performance of the 0.3mL counting vials enables just adequate resolution of 25mg and very good resolution of 100mg carbon samp…
Southern Methodist University Radiocarbon Date List III
The dates presented in this list were determined between June 1974 and October 1983. They relate to projects in North America and in Algeria. Dates with numbers prior to SMU-500 have generally no correction for fractionation. Following this initial series of dates an increasing number of δ 13 C/ 12 C measurements were made by an outside laboratory, especially if the submitter requested a fractionation correction or if the sample was of carbonate …
Scintillation Counter Performance at the SMU Radiocarbon Laboratory
Results are presented of a study of counter performance and vial characteristics for three liquid scintillation counters used at the SMU Radiocarbon Laboratory: the Intertechnique LS20, Packard Tri-Carb 460C, and LKB Wallac Rack Beta 1217. Modifications to photomultiplier tube high voltage, pre-amplifier gain, energy window settings, counting vial design, and sample holder design have resulted in reduced background, higher counting efficiency, an…
Dating of Holocene Stratigraphy with Soluble and Insoluble Organic Fractions at the Lubbock Lake Archaeological Site, Texas: An Ideal Case Study
The Lubbock Lake site, on the Southern High Plains of Texas, contains one of the most complete and best-dated late Quaternary records in North America. A total of 117 14 C dates arc available from the site, determined by the Smithsonian and SMU Laboratories. Of these dates, 84 have been derived from residues (humin) and humates (humic acids) of organic-rich marsh sediments and A horizons of buried soils. Most of the ages are consistent with dates…
Radiocarbon Ages from the Lubbock Lake Site: 1981-1984
Forty-eight additional radiocarbon ages became available for Lubbock Lake (Southern High Plains of Texas) during the period 1981-1984. A new but unreliable radiocarbon age is available from Stratum 1 (deposition ending about 11,000 years B.P.; Clovisage occupation). Thirty-three new radiocarbon ages are available from Stratum 2 and suggest the following refinements to the previously established radiocarbon chronology for the deposit: (1) the init…
Distribution of Gaseous 12 CO 2 , 13 CO 2 , and 14 CO 2 in the Sub-Soil Unsaturated Zone of the Western US Great Plains
Data on the depth distribution of the major atmospheric gases and the abundance of gaseous 12 CO 2 , 13 CO 2 , and 14 CO 2 in the subsoil unsaturated zone have been obtained from several sites in the western Great Plains of the United States. Sample profiles range from land surface to depths of 50m. Although each site must be considered on an individual basis, several general statements can be made regarding the profiles. 1) Diffusion of these ga…
Mid-Wisconsinan Radiocarbon Dates from Mastodon- and Mammoth-Bearing Springs, Ozark Highland, Missouri
From 1966 to 1979, the University of Missouri, the University of Arizona, and the Illinois State Museum conducted extensive interdisciplinary investigations of Late Pleistocene peat deposits associated with springs, some extinct, in the Pomme de Terre River Valley of the Ozark Highland, Missouri (fig 1). Most of the sites are now beneath the waters of the Harry S Truman reservoir. Archaeologic investigations in the area produced a remarkably long…
CO 2 and 14 CO 2 Measurements on Soil Atmosphere Sampled in the Sub-Surface Unsaturated Zone in the Western Great Plains of the US
Soil gas samples were obtained from the unsaturated zone at eight sites in the Great Plains. Three of these sites were sampled extensively for gas composition and carbon isotopes. Sampling equipment consisted of a nest of gas probes vertically spaced by roughly 3m at most sites, generally approaching the water table. Water wells, 10cm in diameter, were screened in the topmost layer groundwater. Inverted cattle tanks were used to collect CO 2 samp…
Radiocarbon Ages From The Lubbock Lake Site, 1950-1980: Framework For Gul Tural And Ecological Change On The Southern High Plains
The Lubbock Lake site is a well-stratified archaeological locality on the Southern High Plains of Texas. It contains a thick sequence of late Quaternary deposits with associated soils and cultural, faunal, and floral remains. Sixty-sevenradiocarbon ages-thus far are availa?le from the site, providing a well-dated chronology spanmng the past 11 ,000 years.Radiocarbon ages were determined on a variety of materials including wood, charcoal, shell, b…
Canyon Creek: A Late Pleistocene Vertebrate Locality in Interior Alaska
The Canyon Creek vertebrate-fossil locality is an extensive road cut near Fairbanks that exposes sediments that range in age from early Wisconsin to late Holocene. Tanana River gravel at the base of the section evidently formed during the Delta Glaciation of the north-central Alaska Range. Younger layers and lenses of fluvial sand are interbedded with arkosic gravel from Canyon Creek that contains tephra as well as fossil bones of an interstadial…
Radiocarbon Evidence for Holocene Recharge of Groundwater, Western Desert, Egypt
During Pleistocene pluvial precipitation was sufficient for the maintenance of groundwater supported lakes and for the accumulation of playa lakes in wind-scoured depressions during the early Holocene pluvial. At places where ground water reaches near to the surface, wells (birs) have been dug and maintained in historic times. These birs have been used as sampling sites for water analyses, including carbon-14 levels, carbon and oxygen stable isot…
Radiocarbon Dating of Bone Apatite Using Thermal Release of CO 2
Extraction of carbon from bone hydroxy apatite as CO 2 by heating in an oxygen atmosphere is an alternative method to hydrolysis of the bone. Heating in specific steps allows separation of CO 2 fractions from different sources, including weakened or sound bone material and secondary deposits. Pretreatments to remove most secondary carbonate and much of the collagen are necessary. Thermogravimetric (weight loss) curves and CO 2 release patterns du…
The Elcor Burial Cave: An Example Of Public Archaeology From West Texas
The discovery of a small sinkhole cave in West Texas led to the recovery of seven human skulls that represent a secondary burial of undetermined age. Radiocarbon dating of two skulls and anthropometric study of the entire sample suggest that the skulls belong to prehistoric indians physically similar to those of the Trans-Pecos about A.D. 900-1100. The study stresses the importance of following up leads from the general public and involving conce…
Differential Mortuary Treatment among the Andean Chinchorro Fishers: Social Inequalities or In Situ Regional Cultural Evolution
A chronology of middle Missouri Plains village sites
Radiocarbon Ages From The Lubbock Lake Site, 1950-1980: Framework For Gul Tural And Ecological Change On The Southern High Plains
The Lubbock Lake site is a well-stratified archaeological locality on the Southern High Plains of Texas. It contains a thick sequence of late Quaternary deposits with associated soils and cultural, faunal, and floral remains. Sixty-sevenradiocarbon ages-thus far are availa?le from the site, providing a well-dated chronology spanmng the past 11 ,000 years.Radiocarbon ages were determined on a variety of materials including wood, charcoal, shell, b…
Radiocarbon Dates of Old and Middle Kingdom Monuments in Egypt
Between 1984 and 1995 over 450 organic samples were collected from monuments built during the Old and Middle Kingdoms. The most suitable samples were selected for dating. The purpose was to establish a radiocarbon chronology with samples from secure context and collected with the careful techniques required for 14 C samples. This chronology is compared to the historical chronology established by reconstructing written documentation
Radiocarbon Dates from the Monumental Architecture at Chavín de Huántar, Perú
Radiocarbon Dating of Bone Apatite Using Thermal Release of CO 2
Extraction of carbon from bone hydroxy apatite as CO 2 by heating in an oxygen atmosphere is an alternative method to hydrolysis of the bone. Heating in specific steps allows separation of CO 2 fractions from different sources, including weakened or sound bone material and secondary deposits. Pretreatments to remove most secondary carbonate and much of the collagen are necessary. Thermogravimetric (weight loss) curves and CO 2 release patterns du…
Small Sample 14 C Dating by Liquid Scintillation Spectrometry
Small sample 14 C dating is tested using conventional as well as high-resolution low-level liquid scintillation (LS) spectrometers. Contrasted are the results obtained dating ∼25, 125 and 250mg of elemental carbon in standard size counting vials (3mL) and 0.3mL teflon and quartz vials. It is demonstrated that the improved performance of the 0.3mL counting vials enables just adequate resolution of 25mg and very good resolution of 100mg carbon samp…
Scintillation Counter Performance at the SMU Radiocarbon Laboratory
Results are presented of a study of counter performance and vial characteristics for three liquid scintillation counters used at the SMU Radiocarbon Laboratory: the Intertechnique LS20, Packard Tri-Carb 460C, and LKB Wallac Rack Beta 1217. Modifications to photomultiplier tube high voltage, pre-amplifier gain, energy window settings, counting vial design, and sample holder design have resulted in reduced background, higher counting efficiency, an…
Dating of Holocene Stratigraphy with Soluble and Insoluble Organic Fractions at the Lubbock Lake Archaeological Site, Texas: An Ideal Case Study
The Lubbock Lake site, on the Southern High Plains of Texas, contains one of the most complete and best-dated late Quaternary records in North America. A total of 117 14 C dates arc available from the site, determined by the Smithsonian and SMU Laboratories. Of these dates, 84 have been derived from residues (humin) and humates (humic acids) of organic-rich marsh sediments and A horizons of buried soils. Most of the ages are consistent with dates…
A New Radiocarbon Chronology for Prehistoric Sites in Nubia
The sequence of prehistoric cultural developments in Nubia has been regarded as one of the best-dated series in North Africa. Eighteen new dates obtained by redating of residues from previously dated samples and the processing of samples held in storage plus a series of recently excavated examples have indicated, however, the need for significant revision of the original chronology. Almost all of the new dates, whether derived from residues or fr…
Southern Methodist University Radiocarbon Date List I
The SMU Radiocarbon Laboratory is operated by the Department of Geological Sciences within the Institute for the Study of Earth and Man. One laboratory room contains the benzene synthesis system where samples are pretreated and converted to CO 2 in a standard way and gas is purified after the procedures of Broecker (1957) by passage through hot CuO, 10% AgNO 3 solution, chromic acid, hot copper, and P 2 O 5 via cryogenic pumping with liquid nitro…
Southern Methodist University Radiocarbon Date List II
All samples described in this date list have been dated from November 1973 to January 1975. Only the benzene liquid scintillation installation was used during this time. For the combustion of soil and fossil bone samples containing a high content of sulfur ( ie , in the form of pyrite), a new CO 2 extraction and cleaning system was built. The gases released by the combustion are dried in ice and dry ice traps, passed through hot copper oxide and …
Radiocarbon Ages from the Lubbock Lake Site: 1981-1984
Forty-eight additional radiocarbon ages became available for Lubbock Lake (Southern High Plains of Texas) during the period 1981-1984. A new but unreliable radiocarbon age is available from Stratum 1 (deposition ending about 11,000 years B.P.; Clovisage occupation). Thirty-three new radiocarbon ages are available from Stratum 2 and suggest the following refinements to the previously established radiocarbon chronology for the deposit: (1) the init…
Distribution of Gaseous 12 CO 2 , 13 CO 2 , and 14 CO 2 in the Sub-Soil Unsaturated Zone of the Western US Great Plains
Data on the depth distribution of the major atmospheric gases and the abundance of gaseous 12 CO 2 , 13 CO 2 , and 14 CO 2 in the subsoil unsaturated zone have been obtained from several sites in the western Great Plains of the United States. Sample profiles range from land surface to depths of 50m. Although each site must be considered on an individual basis, several general statements can be made regarding the profiles. 1) Diffusion of these ga…
CO 2 and 14 CO 2 Measurements on Soil Atmosphere Sampled in the Sub-Surface Unsaturated Zone in the Western Great Plains of the US
Soil gas samples were obtained from the unsaturated zone at eight sites in the Great Plains. Three of these sites were sampled extensively for gas composition and carbon isotopes. Sampling equipment consisted of a nest of gas probes vertically spaced by roughly 3m at most sites, generally approaching the water table. Water wells, 10cm in diameter, were screened in the topmost layer groundwater. Inverted cattle tanks were used to collect CO 2 samp…
Radiocarbon Evidence for Holocene Recharge of Groundwater, Western Desert, Egypt
During Pleistocene pluvial precipitation was sufficient for the maintenance of groundwater supported lakes and for the accumulation of playa lakes in wind-scoured depressions during the early Holocene pluvial. At places where ground water reaches near to the surface, wells (birs) have been dug and maintained in historic times. These birs have been used as sampling sites for water analyses, including carbon-14 levels, carbon and oxygen stable isot…
The Elcor Burial Cave: An Example Of Public Archaeology From West Texas
The discovery of a small sinkhole cave in West Texas led to the recovery of seven human skulls that represent a secondary burial of undetermined age. Radiocarbon dating of two skulls and anthropometric study of the entire sample suggest that the skulls belong to prehistoric indians physically similar to those of the Trans-Pecos about A.D. 900-1100. The study stresses the importance of following up leads from the general public and involving conce…
Southern Methodist University Radiocarbon Date List III
The dates presented in this list were determined between June 1974 and October 1983. They relate to projects in North America and in Algeria. Dates with numbers prior to SMU-500 have generally no correction for fractionation. Following this initial series of dates an increasing number of δ 13 C/ 12 C measurements were made by an outside laboratory, especially if the submitter requested a fractionation correction or if the sample was of carbonate …
Change of Calibration Parameters in Frequently Used Vials in Benzene Scintillation Counting
Scintillation counting vials used for counting synthesized benzene accumulate an inside coating which is insoluble in benzene. This coating reduces the photon transfer from the vial and lowers its observed background. Age calculations that include calibration data collected with other vials may be inaccurate if this effect is not considered. Frequent cleaning of the counting vials with strong acid solutions keeps the coating from accumulating. A …
Laboratories
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
Mid-Wisconsinan Radiocarbon Dates from Mastodon- and Mammoth-Bearing Springs, Ozark Highland, Missouri
From 1966 to 1979, the University of Missouri, the University of Arizona, and the Illinois State Museum conducted extensive interdisciplinary investigations of Late Pleistocene peat deposits associated with springs, some extinct, in the Pomme de Terre River Valley of the Ozark Highland, Missouri (fig 1). Most of the sites are now beneath the waters of the Harry S Truman reservoir. Archaeologic investigations in the area produced a remarkably long…
Southern Methodist University Radiocarbon Date List I
The SMU Radiocarbon Laboratory is operated by the Department of Geological Sciences within the Institute for the Study of Earth and Man. One laboratory room contains the benzene synthesis system where samples are pretreated and converted to CO 2 in a standard way and gas is purified after the procedures of Broecker (1957) by passage through hot CuO, 10% AgNO 3 solution, chromic acid, hot copper, and P 2 O 5 via cryogenic pumping with liquid nitro…
Southern Methodist University Radiocarbon Date List II
All samples described in this date list have been dated from November 1973 to January 1975. Only the benzene liquid scintillation installation was used during this time. For the combustion of soil and fossil bone samples containing a high content of sulfur ( ie , in the form of pyrite), a new CO 2 extraction and cleaning system was built. The gases released by the combustion are dried in ice and dry ice traps, passed through hot copper oxide and …
A New Radiocarbon Chronology for Prehistoric Sites in Nubia
The sequence of prehistoric cultural developments in Nubia has been regarded as one of the best-dated series in North Africa. Eighteen new dates obtained by redating of residues from previously dated samples and the processing of samples held in storage plus a series of recently excavated examples have indicated, however, the need for significant revision of the original chronology. Almost all of the new dates, whether derived from residues or fr…
Radiocarbon Evidence for Holocene Recharge of Groundwater, Western Desert, Egypt
During Pleistocene pluvial precipitation was sufficient for the maintenance of groundwater supported lakes and for the accumulation of playa lakes in wind-scoured depressions during the early Holocene pluvial. At places where ground water reaches near to the surface, wells (birs) have been dug and maintained in historic times. These birs have been used as sampling sites for water analyses, including carbon-14 levels, carbon and oxygen stable isot…
Radiocarbon Dating of Bone Apatite Using Thermal Release of CO 2
Extraction of carbon from bone hydroxy apatite as CO 2 by heating in an oxygen atmosphere is an alternative method to hydrolysis of the bone. Heating in specific steps allows separation of CO 2 fractions from different sources, including weakened or sound bone material and secondary deposits. Pretreatments to remove most secondary carbonate and much of the collagen are necessary. Thermogravimetric (weight loss) curves and CO 2 release patterns du…
The Elcor Burial Cave: An Example Of Public Archaeology From West Texas
The discovery of a small sinkhole cave in West Texas led to the recovery of seven human skulls that represent a secondary burial of undetermined age. Radiocarbon dating of two skulls and anthropometric study of the entire sample suggest that the skulls belong to prehistoric indians physically similar to those of the Trans-Pecos about A.D. 900-1100. The study stresses the importance of following up leads from the general public and involving conce…
Canyon Creek: A Late Pleistocene Vertebrate Locality in Interior Alaska
The Canyon Creek vertebrate-fossil locality is an extensive road cut near Fairbanks that exposes sediments that range in age from early Wisconsin to late Holocene. Tanana River gravel at the base of the section evidently formed during the Delta Glaciation of the north-central Alaska Range. Younger layers and lenses of fluvial sand are interbedded with arkosic gravel from Canyon Creek that contains tephra as well as fossil bones of an interstadial…
Distribution of Gaseous 12 CO 2 , 13 CO 2 , and 14 CO 2 in the Sub-Soil Unsaturated Zone of the Western US Great Plains
Data on the depth distribution of the major atmospheric gases and the abundance of gaseous 12 CO 2 , 13 CO 2 , and 14 CO 2 in the subsoil unsaturated zone have been obtained from several sites in the western Great Plains of the United States. Sample profiles range from land surface to depths of 50m. Although each site must be considered on an individual basis, several general statements can be made regarding the profiles. 1) Diffusion of these ga…
Mid-Wisconsinan Radiocarbon Dates from Mastodon- and Mammoth-Bearing Springs, Ozark Highland, Missouri
From 1966 to 1979, the University of Missouri, the University of Arizona, and the Illinois State Museum conducted extensive interdisciplinary investigations of Late Pleistocene peat deposits associated with springs, some extinct, in the Pomme de Terre River Valley of the Ozark Highland, Missouri (fig 1). Most of the sites are now beneath the waters of the Harry S Truman reservoir. Archaeologic investigations in the area produced a remarkably long…
CO 2 and 14 CO 2 Measurements on Soil Atmosphere Sampled in the Sub-Surface Unsaturated Zone in the Western Great Plains of the US
Soil gas samples were obtained from the unsaturated zone at eight sites in the Great Plains. Three of these sites were sampled extensively for gas composition and carbon isotopes. Sampling equipment consisted of a nest of gas probes vertically spaced by roughly 3m at most sites, generally approaching the water table. Water wells, 10cm in diameter, were screened in the topmost layer groundwater. Inverted cattle tanks were used to collect CO 2 samp…
Radiocarbon Ages From The Lubbock Lake Site, 1950-1980: Framework For Gul Tural And Ecological Change On The Southern High Plains
The Lubbock Lake site is a well-stratified archaeological locality on the Southern High Plains of Texas. It contains a thick sequence of late Quaternary deposits with associated soils and cultural, faunal, and floral remains. Sixty-sevenradiocarbon ages-thus far are availa?le from the site, providing a well-dated chronology spanmng the past 11 ,000 years.Radiocarbon ages were determined on a variety of materials including wood, charcoal, shell, b…
Radiocarbon Ages from the Lubbock Lake Site: 1981-1984
Forty-eight additional radiocarbon ages became available for Lubbock Lake (Southern High Plains of Texas) during the period 1981-1984. A new but unreliable radiocarbon age is available from Stratum 1 (deposition ending about 11,000 years B.P.; Clovisage occupation). Thirty-three new radiocarbon ages are available from Stratum 2 and suggest the following refinements to the previously established radiocarbon chronology for the deposit: (1) the init…
Dating of Holocene Stratigraphy with Soluble and Insoluble Organic Fractions at the Lubbock Lake Archaeological Site, Texas: An Ideal Case Study
The Lubbock Lake site, on the Southern High Plains of Texas, contains one of the most complete and best-dated late Quaternary records in North America. A total of 117 14 C dates arc available from the site, determined by the Smithsonian and SMU Laboratories. Of these dates, 84 have been derived from residues (humin) and humates (humic acids) of organic-rich marsh sediments and A horizons of buried soils. Most of the ages are consistent with dates…
Southern Methodist University Radiocarbon Date List III
The dates presented in this list were determined between June 1974 and October 1983. They relate to projects in North America and in Algeria. Dates with numbers prior to SMU-500 have generally no correction for fractionation. Following this initial series of dates an increasing number of δ 13 C/ 12 C measurements were made by an outside laboratory, especially if the submitter requested a fractionation correction or if the sample was of carbonate …
Scintillation Counter Performance at the SMU Radiocarbon Laboratory
Results are presented of a study of counter performance and vial characteristics for three liquid scintillation counters used at the SMU Radiocarbon Laboratory: the Intertechnique LS20, Packard Tri-Carb 460C, and LKB Wallac Rack Beta 1217. Modifications to photomultiplier tube high voltage, pre-amplifier gain, energy window settings, counting vial design, and sample holder design have resulted in reduced background, higher counting efficiency, an…
Small Sample 14 C Dating by Liquid Scintillation Spectrometry
Small sample 14 C dating is tested using conventional as well as high-resolution low-level liquid scintillation (LS) spectrometers. Contrasted are the results obtained dating ∼25, 125 and 250mg of elemental carbon in standard size counting vials (3mL) and 0.3mL teflon and quartz vials. It is demonstrated that the improved performance of the 0.3mL counting vials enables just adequate resolution of 25mg and very good resolution of 100mg carbon samp…
Laboratories
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
Participants
From the 14th International Radiocarbon Conference held in Tucson, AZ, May 20-24, 1991
Radiocarbon Updates
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
First Radiocarbon Dates for San Josecito Cave, Nuevo León, México
Initial excavations (1935-1941) in San Josecito Cave, Nuevo León, México revealed a rich late Quaternary fossil fauna. The San Josecito Cave fauna was viewed as a single time-related entity despite the lack of 14 C dating. Renewed excavations (1990) recovered a series of 14 C samples related to the complex stratigraphy. Six 14 C dates show that the recently excavated deposits range in age between 45,000 and 27,000 yr B.P. These ages suggest that …
Conference Participants
This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries
Change of Calibration Parameters in Frequently Used Vials in Benzene Scintillation Counting
Scintillation counting vials used for counting synthesized benzene accumulate an inside coating which is insoluble in benzene. This coating reduces the photon transfer from the vial and lowers its observed background. Age calculations that include calibration data collected with other vials may be inaccurate if this effect is not considered. Frequent cleaning of the counting vials with strong acid solutions keeps the coating from accumulating. A …
Calibration Technique for 14 C Data Clusters: Fitting Relative Chronologies onto Absolute Time Scales
Application of radiocarbon dating to a short chronology is often limited by the wide probability ranges of calibrated dates. These wide ranges are caused by multiple intersections of the 14 C age with the tree-ring curve. For a single unrelated 14 C date, each intersection presents a probable solution. When several dates on different events are available, identification of the most probable solution for each event is possible if one can obtain so…
Radiocarbon Dates of Old and Middle Kingdom Monuments in Egypt
Between 1984 and 1995 over 450 organic samples were collected from monuments built during the Old and Middle Kingdoms. The most suitable samples were selected for dating. The purpose was to establish a radiocarbon chronology with samples from secure context and collected with the careful techniques required for 14 C samples. This chronology is compared to the historical chronology established by reconstructing written documentation
Differential Mortuary Treatment among the Andean Chinchorro Fishers: Social Inequalities or In Situ Regional Cultural Evolution
Radiocarbon dating (22 works) · Geology (21 works) · Archaeology (18 works) · Geography (16 works) · Archaeology and ancient environmental studies (12 works) · Chemistry (12 works) · Paleontology (12 works) · Chronology (7 works) · Mineralogy (7 works) · Radiochemistry (7 works)