action - something that you do protective - (being) something that protects protective action - things you do, to protect yourself or other people (from something) recomâ¦mendations - someone has done some research; this is a list of what they think is good protective action recommendations - a list of things someone thinks you should do to protect ...
Stable isotope analysis gives an independent measure of fractionation such that if, for instance, a sample is 1.5% heavier in 13C than modern standard carbon through the effects of fractionation, then it will be 3% heavier in 14C than it would have been had fractionation not taken place.
radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reached.The stable end product is a nonradioactive isotope of another element, i.e., radium-226 decays finally to lead-206.agazine article from: Antiquity ...measurement of a particular radioactive isotope of carbon (14C...can date the beginnings of isotope archaeology to the mid 1960s...first measurements of lead isotopes in archaeological metals...drawn the parallel between isotope archaeology and isotope geochemistry, it is ...