NOVELTY - Carbon dioxide leak age rate from sequestration reservoirs is measured by adding tracer molecules from sulfur or halogen containing compounds, hydrocarbon compounds, perfluorocarbon compounds and inert gases to carbon dioxide at a predetermined molar ratio; allowing the tracer molecules and carbon dioxide to mix homogeneously; and injecting the homogenous mixture of tracer molecules and carbon dioxide into sequestration reservoirs.    USE - Method of measuring carbon dioxide leak age rate from sequestration reservoirs.    ADVANTAGE - The method can monitor the leakage of carbon dioxide from geological reservoirs, introduces the tracers into the reservoirs along with the carbon dioxide without being affected by atmospheric gases due to low background levels of tracers in the atmosphere, employs tracers that are detectable at extremely low concentrations and having low detection limits, and utilizes low cost raw materials thus lowering operational costs.    DETAILED DESCRIPTION - Carbon dioxide leak age rate from sequestration reservoirs is measured by:    (A) adding tracer molecules from sulfur or halogen containing compounds, hydrocarbon compounds, perfluorocarbon compounds and inert gases to carbon dioxide at a predetermined molar ratio;    (B) allowing the tracer molecules and carbon dioxide to mix homogeneously;    (C) injecting the homogenous mixture of tracer molecules and carbon dioxide into sequestration reservoirs;    (D) collecting leaked tracer molecules onto a sorbent during a known time period onto sorbents specific for retaining the tracer molecules at or near injection points, fracture zones, formation outcroppings, areas around an underground carbon dioxide plume soil atmosphere interface, aerial collection towers, unmanned aerial vehicles, or freshwater aquifers or wells; and    (E) measuring concentrations of both the collected tracer molecules and carbon dioxide to determine the rate of carbon dioxide leakage over a period of time.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a modified instrument for use in the measurement of carbon dioxide flux from soil gases.    Accumulation chamber (34)    Analyzer sensor head (40)    Cooling fan (42)    Tubing (44)    Analyzer mounting plate (46)