The vapor-phase tracer R-134a has been used in sev-eral tracer tests in vapor-dominated and two-phase geothermal systems. This paper describes laboratory studies designed to produce kinetic parameters for the decay of R-134a in the system water-steam-nitrogen-tracer are described. The kinetic parameters calcu-lated from the experimental data were used to ex-trapolate to conditions in The Geysers steam reser-voir. The results indicate that R-134a is sufficiently stable to be used in tracer tests conducted in the nor-mal Geysers reservoir, but that a correction for ther-mal decay should be applied if R-134a is used in the high-temperature reservoir.

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