The temperature at which this happens is known as the closure temperature or blocking temperature and is specific to a particular material and isotopic system. Molecular clock. The possible confounding effects of contamination of parent and daughter isotopes have to be considered, as do the effects of any loss or gain of such isotopes since the sample was created. Since then accelerator mass spectrometry at lawrence.
Radiometric datingradioactive dating or radioisotope dating is a technique used to date materials such as rocks or carbonin which trace radioactive impurities were selectively incorporated when they were formed.