Isotopes Flashcards Preview

Forensics > Isotopes > Flashcards

Flashcards in Isotopes Deck (19):
1

isotope

variants of a chemical element; different neutrons

2

isotopic analysis identifies:

isotopic signatures found in soil, food, human tissue, other materials

3

isotopically light

more negative; depelted

4

isotopically heavy

more positive; enriched

5

stable

do not change over time; stable nucleus

6

unstable

decrease or decay over predictable periods; radiation

7

spectrometers

distinguish isotopes

8

where are isotopes found

naturally made; air, water, soil.

9

most common elements for isotopic analysis

carbon
nitrogen- atmosphere, plants
oxygen
hydrogen
strontium- rocks and soil

10

utility

vary naturally and predictable in environment; food chain; diet and geographic origins

11

teeth

stable isotopes; like calcium; anthropologists- track where you lived

12

hair

reflect drinking water; closest to root= most recent

13

bone

diet- type of food consumed and isotopic signature in collagen

14

turnover rates

muscle- months
plasma- hours to days
RBC- weeks
bone- years/decades

15

forensics applications

unidentified remains- narrow geographic focus
historical cases- king richard III
drug related cases- origin
counterfeit cases- whiskey

16

cocaine

bolivia, columbia, peru- C13 on coca leaf

17

whiskey

scottish economy; water from distilleries; build databases

18

king richard

remains recovered; samples taken; diet and geography

19

disaster victim identification

swiss air, haiti earthquake, kenya terrorist attack