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A method using solvent extraction following a preconcentration of iodine by evaporation was developed for separation of iodine in waters associated with coalbed methane (CBM) for the determination of 129I using accelerator mass spectrometry, for exploration of CBM resources. The 129I/127I ratios in water samples collected in a CBM field have been determined using the developed method to be (1.6–2.4) × 10–11, which are 2–3 orders of magnitudes lower than that of environmental samples in Xi'an, but 2 orders of magnitude higher than the procedure blank of (1.5–2.1) × 10–13, confirming no measurable crossover contamination during sample analysis and slightly input of modern water in the CBM water. [ABSTRACT FROM AUTHOR]

A rapid analytical method for sequential separation and determination of the most significant α- and β-emitting radionuclidic impurities in 99Tc radiopharmaceutical raw material is presented. Successive HTiO co-precipitation steps were first conducted for effective removal of 99Tc to avoid its spectral interference on the determination of β-emitting nuclides by liquid scintillation counting. A sequential chromatographic method was applied for simultaneous separation and purification of actinide and lanthanide isotopes. A series of K99TcO4 solution spiked with known quantities of 238Pu, 239Pu, 241Pu, 237Np, 241Am, 244Cm and 147Pm were analyzed for method evaluation, demonstrating that the method would meet the analytical requirements for radionuclidic impurity evaluation of K99TcO4 raw material. [ABSTRACT FROM AUTHOR]

Speciation analysis of long-lived I in seawater can provide useful information on the source of water masses. This paper presents an improved method for speciation analysis of I based on coprecipitation of iodide as AgI with AgSO and AgCl. By adding a small amount of I carrier, the separation efficiency of iodine species and the accuracy and precision of I measurement are remarkably improved. I species in depth profiles of seawater from the Antarctic were analyzed for investigation of water circulation in the Antarctic. [ABSTRACT FROM AUTHOR]