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We have manufactured more than 250 nominally identical paraffin-coated Csvapor cells (30 mm diameter bulbs) for multi-channel atomic magnetometerapplications. We describe our dedicated cell characterization apparatus. Foreach cell we have determined the intrinsic longitudinal, $\sGamma{01}$, andtransverse, $\sGamma{02}$, relaxation rates. Our best cell shows$\sGamma{01}/2\pi\approx 0.5 Hz, and $\sGamma{02}/2\pi\approx 2 Hz. We find astrong correlation of both relaxation rates which we explain in terms ofreservoir and spin exchange relaxation. For each cell we have determined theoptimal combination of rf and laser powers which yield the highest sensitivityto magnetic field changes. Out of all produced cells, 90% are found to havemagnetometric sensitivities in the range of 9 to 30 fTHz. Noise analysis showsthat the magnetometers operated with such cells have a sensitivity close to thefundamental photon shot noise limit.

A large sample study of spin relaxation and magnetometric sensitivity of paraffin-coated Cs vapor cells