17.08.2015   IAEA RADIATION TECHNOLOGY SERIES No

Laboratory tracer analysis

2.3.3.1. Tracer analysis of samples from the geothermal fields

(i) Analysis of HTO

HTO in samples from geothermal fluids is analysed using liquid scintillation counting. HTO analysis is performed by a direct counting method after a sample distillation pretreatment process. In the analysis, 11 mL of

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FIG. 23. Example of collected water samples with varying degree of oil. A is a sample typically taken from a test separator, B can be both from a test separator orfrom the flow line with a high water cut while C is typically from the flow line with a very low water cut.

carrier (127I-), precipitation by silver as Agl followed by dissolution of the precipitate in the scintillation cocktail by addition of thiourea. The sample is then analysed by liquid scintillation counting.

All details of the analytical protocol are given in Appendix III. This protocol also includes the detailed procedure used to prepare 125I — for gamma spectroscopy measurement.