We report H2, CO, and CO2pumping speed measurements on a linear pump using NEG strip St 707 (Saes Getters Inc.) as a function of both adsorbed gases and number of activations. To simulate the conditions of an operating storage ring a gas mixture of 50% H2, 35% CO, and 15% CO2is used in all measurements. Initial measured pumping speeds of>450l m−1 s−1decrease to 200 and 100l m−1 s−1for H2and CO, respectively, after 70 air exposures. A further drop to 50l m−1 s−1for CO occurs at CO loading of 1×10−2Torr l m−1. CO2and CO pumping speeds are about the same. The photon stimulated desorption for both baked and activated strips is an order of magnitude lower than that for stainless steel.