Scientists at NOAA's Pacific Islands Fisheries Science Center in Honolulu have been working on how to accurately determine the age of a given species of fish by using two measures of radiation decay over time.
To determine ages of adult opakapaka, PIFSC researchers have recently applied a pair of different radioisotope approaches to the fish otoliths.
Radium is a chemical element with symbol Ra and atomic number 88.
It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals.
Selected studies from the recent literature are provided as examples of these modern applications of radium isotopes.
In December of 1898, Marie and Pierre Curie announced the discovery of a second element found in the uranium-extracted residues of pitchblende ore and, due to the intense radiation rays it emitted, it was named radium .