129I and 36Cl concentrations in waters of the eastern Clear Lake area, California: Residence times and source ages of hydrothermal fluids

Hydrologic and Geochemical Controls on the Transport of Radionuclides in Natural Undisturbed Arid Environments as Determined by Accelerator Mass Spectrometry Measurements

“…Within a factor of two this has been borne out by the few measurements that have been made from pre-nuclear sources. A pre-bomb-pulse very dilute groundwater sample from Clear Lake, California, had a 129 I/I ratio of 8.9 x 10 -12 (Fehn et al, 1992), while iodine leached from marine sediment an averaged ratio of about 1.3 x 10 -12 (Fehn et al, 1986). Bomb-pulse values measured in these studies were 8.3 x 10 -11 (dilute groundwater) and about 8.5 x 10 -11 (marine sediment).…”

Lithogenic and cosmogenic tracers in catchment hydrology

“…Chlorine-36 has been used to discriminate groundwater bodies and assess degrees of mixing (Phillips et 1993), to place constraints on groundwater age (Bentley et al, 1986bPhillips et al, 1986Fabryka-Martin et al, 1991;Torgerson et al, 1991;Fehn et al, 1992), to identify very young -bomb-pulse -groundwater (Bentley et al, 1982;Haberstock et al, 1986;Purdy et al, 1987), to determine instances of vertical recharge along a flow path (Purdy et al, 1987), to identify sources of chlorinity and salinity (Andrews et al, 1986;1989;Paul et al, 1986;Phillips et al, 1986), to identify sources of salt deposits (Margaritz et Iodine-129 is in many ways similar to 36Cl. It is a soluble halogen that is fairly non-reactive, generally exists as a non-sorbing anion in groundwater, and is produced in cosmogenic, thermonuclear, and in-situ neutron-induced reactions.…”

“…It has been demonstrated t o have value in placing constraints on groundwater age (Fabryka-Martin et al, 1985;1989;Fehn et al, 1992;Moran et al, 1993), determining groundwater migration paths , identifying sources of salinity in groundwater and sources of salts in evaporite deposits (Fabryka-Martin et al, 1985;Fabryka-Martin et al, 1991;Fehn et al, 19921, estimating weathering rates and the behavior of iodine and uranium during weathering (Fabryka-Martin et al, 1988), and identifying the source geologic formation for hydrocarbons (Fabryka-Martin et al, 1985). These studies indicate the utility of 1291 in hydrologic studies.…”

Lithogenic and Cosmogenic Tracers in Catchment Hydrology

“…It has been demonstrated t o have value in placing constraints on groundwater age (Fabryka-Martin et al, 1985;1989;Fehn et al, 1992;Moran et al, 1993), determining groundwater migration paths , identifying sources of salinity in groundwater and sources of salts in evaporite deposits (Fabryka-Martin et al, 1985;Fabryka-Martin et al, 1991;Fehn et al, 19921, estimating weathering rates and the behavior of iodine and uranium during weathering (Fabryka-Martin et al, 1988), and identifying the source geologic formation for hydrocarbons (Fabryka-Martin et al, 1985). These studies indicate the utility of 1291 in hydrologic studies.…”

“…Chlorine-36 has been used to discriminate groundwater bodies and assess degrees of mixing (Phillips et 1993), to place constraints on groundwater age (Bentley et al, 1986bPhillips et al, 1986Fabryka-Martin et al, 1991;Torgerson et al, 1991;Fehn et al, 1992), to identify very young -bomb-pulse -groundwater (Bentley et al, 1982;Haberstock et al, 1986;Purdy et al, 1987), to determine instances of vertical recharge along a flow path (Purdy et al, 1987), to identify sources of chlorinity and salinity (Andrews et al, 1986;1989;Paul et al, 1986;Phillips et al, 1986), to identify sources of salt deposits (Margaritz et Iodine-129 is in many ways similar to 36Cl. It is a soluble halogen that is fairly non-reactive, generally exists as a non-sorbing anion in groundwater, and is produced in cosmogenic, thermonuclear, and in-situ neutron-induced reactions.…”