HumanIsotopes
Direct isotope values including Strontium Carbon, Nitrogen and Oxygen from human samples including bones and teeth. Note on standards used to express stable isotope values: Carbon ratios from collagen are all expressed relative to the Vienna Pee-Dee Belemnite (VPDB) standard. Nitrogen ratios from collagen are all expressed relative to atmospheric N2 (Air N2). Carbon ratios from the carbonate fraction of enamel or bone bioapatite are all expressed realtive to the Vienna Pee-Dee Belemnite (VPDB) standard. Oxygen ratios from the carbonate fraction bioapatite or enamel are most commonly expressed realtive to Vienna Pee-Dee Belemnite (VPDB) standard, but can be expressed relative to the Vienna Standard Mean Ocean (VSMOW). Becuase of this possibility, the standard used in the source publication should always be recorded. Oxygen ratios from the phosphate fraction bioapatite or enamel are most commonly expressed realtive to the Vienna Standard Mean Ocean (VSMOW), but can be expressed relative to the Vienna Pee-Dee Belemnite (VPDB) standard. Becuase of this possibility, the standard used in the source publication should always be recorded. There are several conversions that can be done to increase the comparability of stable isotope measurements. BIAD does not record these conversions and only records original values.
Column name	Data type	Column description
206Pb/204Pb	decimal	The ratio of 206Pb/204Pb
206Pb/207Pb	decimal	The ratio of 206Pb to 207Pb
207Pb/204Pb	decimal	The ratio of 207Pb to 204Pb
207Pb/206Pb	decimal	The ratio of 207Pb to 206Pb
208Pb/204Pb	decimal	The ratio of 208Pb to 204Pb
208Pb/206Pb	decimal	The ratio of 208Pb to 206Pb
208Pb/207Pb	decimal	The ratio of 208Pb to 207Pb
C/N_collagen	decimal	Carbon / Nitrogen Atomic ratio (C:N) of carbon and nitrogen in the collagen sample.
C_collagen(%)	decimal	Percentage of carbon in the collagen sample.
CitationID	varchar
Collagen(%)	decimal	Percentage of collagen in the sample.
Error_206Pb/204Pb	decimal
Error_207Pb/204Pb	decimal
Error_208Pb/204Pb	decimal
Error_87Sr/86Sr	decimal	Measurement error on the strontium ratio; equivalent to 2SE
HumanIsoID	varchar	Primary key.
IndividualID	varchar	Unique ID for each human specimen
ItemID	varchar	Must exist in the Items table.
LabCode	varchar	Original labcode provided by the lab that generated the strontium values.
Leachate	varchar	Whether strontium measurements were extracted from leachate from the sample element.
MassSpecType	varchar	Type of Mass Spectrometry.
Material	varchar	The material on which the analyses are based.
Mean_87Sr/86Sr	decimal	Strontium isotopic ratio.
N_collagen(%)	decimal	Percentage of nitrogen in the collagen sample.
notes	varchar
Position	varchar
ppm	smallint
S_collagen(%)	decimal	Percentage of Sulfur in the collagen sample.
SampleIDother	varchar	Sometimes additional sample IDs are available, for example one from the archaeologist, another by the isotopic analyst
SegmentMass	decimal	Mass of segment (mg).
SkeletalElement	varchar	Skeletal element (case sensitive); lower case letters correspond to deciduous dentition and upper case correspond to adult dentition.
δ13C_carbonate(‰)	decimal	δ13C of the carbon in the carbonate sample, ‰.
δ13C_collagen(‰)	decimal	δ13C of the carbon in the collagen sample, ‰.
δ13C_collagenStandard	varchar	The standard against which 13C is measured.
δ15N_collagen(‰)	decimal	δ15N of the nitrogen in the collagen sample, ‰.
δ15N_collagenStandard	varchar	The standard against which 15N is measured.
δ18O_carbonate(‰)	decimal	δ18O of the carbon in the carbonate sample, ‰.
δ18O_carbonate(‰)_Standard	varchar	The standard against which d18O values are reported
δ18O_phosphate(‰)	decimal	δ18O of the carbon in the phosphate sample, ‰.
δ18O_phosphate(‰)_Standard	varchar	The stardard againt which d18O reported
δ34S_collagen(‰)	decimal	δ34S of the sulfur in the collagen sample, ‰.