Isotopic search for live 135Cs in the early solar system and possibility of 135Cs–135Ba chronometer

Tellurium isotopic composition of the early solar system—A search for effects resulting from stellar nucleosynthesis, 126Sn decay, and mass-independent fractionation

“…Early formed metal from unequilibrated chondrites may be a suitable material, as Sn is enriched relative to Te in metal. Alternatively, the sequential leaching of carbonaceous chondrites may dissolve phases with different Sn/Te ratios that could reveal Te isotope differences, in the same manner as it is thought that 135 Ba effects reflect the decay of 135 Cs (Hidaka et al, 2001;Hidaka et al, 2003). Other promising samples are CAIs, which are the host of many anomalies from short-lived radionuclides.…”

Short-Lived Radionuclides and Early Solar System Chronology

“…This system is difficult to work with because cesium is a volatile element and is easily transported during aqueous alteration, whereas barium is refractory and immobile. Hidaka et al (2001) presented the first evidence suggesting the presence of 135 Cs in the early solar system. They found that acid leachates from CAI from the Allende CV3 chondrite have high Cs/Ba ratios that were correlated with excess 135 Ba, consistent with 135 Cs/ 133 Cs ¼ (4.82 AE 0.79) Â 10 À4 , which they suggested as the early solar system ratio.…”

“…Given the mobility of cesium, it is unclear whether the 135 Cs/ 133 Cs value recorded by CAIs is the early solar system ratio or the result of later events, such as parent-body aqueous activity. Hidaka et al (2001) Hidaka et al (2001) but must be considered as highly uncertain.…”

Ba isotopic signature for early differentiation between Cs and Ba in natural fission reactors

“…Therefore, in this study, sequential acid leaching treatment was carried out. The procedures were based on the method of Hidaka et al (2001), which is useful for obtaining a high-Cs/Ba fraction from planetary materials. 50-100 mg of each powdered sample was leached using 10 mL of 0.1 M acetic acid-ammonium acetate, 0.1 M HCl, 2 M HCl and aqua regia, successively.…”