A Monte Carlo model, simulated energy deposit in six gaps of multi-gap resistive chamber (MRPC) irradiated by a 6.771Mbq 60Co gamma source, was built in MCNP code. The MRPC primary current, which was too low to be measurable with existing instruments, only was derived from the simulation. The MRPC operation current, after gas avalanche magnifying, was measured employing a PCI-1714A/D DAQ card. The magnification factor, about (0.8±0.12) × 107, was obtained when the operation gas mixture is 5.3% iso-C4H10 and 94.7% C4H2F4, HV is 14kV and the counting rate is about 3Hz/cm2.

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