The thorium isotope content of ocean water

Details The thorium isotope content of ocean water The thorium isotope content of ocean water

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53..419m&link_type=abstract

Earth and Planetary Science Letters, Volume 53, Issue 3, p. 419-426.

Physics

25

Scientific paper

232Th concentrations of surface and deep Pacific Ocean waters are 0.01-0.02 dpm/1000 kg (60 pgm/kg). The 230Th activity is 0.03-0.13 dpm/1000 kg in surface waters and 0.3-2.7 dpm/1000 kg in deep waters. Chemical residence times based on in situ production from parent isotopes are about the same for 230Th and 228Th in surface waters (1-5 years) but are ten times greater for 230Th in deep waters (10-100 years). Apparently there are additional sources of 230Th into deep waters. At MANOP site S manganese nodule tops are enriched in Th isotopes by adsorption of Th from seawater and not by incorporation of Th-rich particulates.

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