Environmental radioactivity
Applications in geology listed by isotope

Environmental radioactivity

Section Title: Applications in geology listed by isotope
Table Section Text: None

element	mass	half-life (years)	typical application

helium	3	stable -	exposure dating of olivine-bearing rocks

beryllium	10	1.36 million	exposure dating of quartz-bearing rocks, sediment, dating of ice cores, measurement of erosion rates

carbon	14	5,730	dating of organic matter, water

neon	21	stable -	dating of very stable, long-exposed surfaces, including meteorites

aluminum	26	720,000	exposure dating of rocks, sediment

chlorine	36	308,000	exposure dating of rocks, groundwater tracer

calcium	41	103,000	exposure dating of carbonate rocks

iodine	129	15.7 million	groundwater tracer

Sentence(s)

Isotope iodine has a mass of 129.

final_sentence: Isotope iodine has a mass of 129.