Tissue-Specific Incorporation
Definition
The principle that different tissues record isotope signals over different time windows: enamel permanently records childhood; hair records month-by-month recent history; bone records multi-decade averages. Choosing the right tissue for the forensic question is critical.
- Enamel
- Records isotope signal permanently from childhood formation
- Hair
- Records recent history, roughly month by month
- Bone
- Reflects a multi-decade average, remodels continuously
- Application
- Isotope geolocation of unidentified remains
Common questions
Why does bone give an average instead of a snapshot?+
Bone tissue remodels continuously throughout life, with older mineral resorbed and replaced by new mineral reflecting recent diet and water intake. The isotope signal in a bone sample is therefore a blend weighted toward the last several years, not a fixed record of one period.
How do examiners combine enamel and hair results on the same remains?+
Enamel fixes a childhood residence signal because teeth mineralize early and do not remodel, while hair segments closest to the root reflect the weeks before death. Comparing the two can show whether a person moved between a childhood region and a place of death.
What happens if the wrong tissue is sampled for the forensic question?+
A question about recent travel answered with enamel, or a question about childhood origin answered with bone, returns a signal from the wrong time window and can mislead an investigation rather than simply being less precise.
Related terms
- δ18O (Delta-18-O)
- The ratio of oxygen-18 to oxygen-16 in a sample expressed in per-mil deviation from the Vienna Standard Mean Ocean Water (VSMOW) standard....
- δ2H (Delta Deuterium)
- The ratio of deuterium to hydrogen in a sample expressed in per-mil deviation from VSMOW. Covaries with δ18O along the global meteoric...
- Global Meteoric Water Line (GMWL)
- The linear relationship δ2H = 8 × δ18O + 10 that describes the global co-variation of O and H isotopes in precipitation....
- Isoscape
- A map of isotope ratio variation across a geographic area, derived from systematic sampling of soil, water, plant, or mineral material; used...
- OIPC (Online Isotopes in Precipitation Calculator)
- A web-based tool and database compiling the IAEA GNIP station network data and providing interpolated δ18O and δ2H predictions for any geographic...