Radiocarbon measures

Sample reference

sample_reference

Sample reference is a unique identifier assigned first by the compiler and then by the IsoArcH database to each collected sample. In each dataset, these numbers will span from 1 to n, with n representing the maximum number of samples compiled. Once in the IsoArcH database, this identifier will include the dataset number as a prefix. GRIST may automatically populate this field. Example: 1

Type	Sections	Required
identifier	hominins bio, samples, mineral measures, organic measures, radiocarbon measures	Yes

Tooth fraction

tooth_fraction

Legacy names

fraction of tooth sample

Tooth fraction refers to the particular portion of the tooth that has been sampled.

Type	Sections	Validations	Required
string	mineral measures, organic measures, radiocarbon measures	Lowercase: yes	No

Allowed Values:

• dentine
  
• enamel
  
• pulp
  

Measure type

measure_type

Measure type indicates whether the isotope and elemental measurements were conducted on a mineral or an organic compound within the sample.

Type	Sections	Validations	Required
string	radiocarbon measures	Lowercase: yes	No

Allowed Values:

• mineral
  
• organic
  

14C lab code

c14_lab_code

14C lab code refers to the unique identifier assigned by a radiocarbon laboratory to a radiocarbon date.

Type	Sections	Required
string	radiocarbon measures	Yes

Uncalibrated 14C date

uncalibrated_c14_date

Legacy names

14C uncalibrated age

Uncalibrated 14C date refers to the raw date directly measured from the sample by a radiocarbon laboratory.

Type	Sections	Unit / Norm	Required
integer	radiocarbon measures	years BP	No

14C date uncertainty

c14_date_uncertainty

Legacy names

14C σ

14C date uncertainty refers to the uncertainty accompanying the raw date directly measured from the sample by a radiocarbon laboratory.

Type	Sections	Unit / Norm	Required
decimal	radiocarbon measures	years BP	No