Ion chamber realized by utilizing gas specific gas flow mode

The invention relates to an ion chamber realized by utilizing a gas specific gas flow mode. The ion chamber comprises a gas inlet pipe, a gas outlet pipe, an ion chamber body, a discharge needle electrode, a collector, an isolation sleeve, a collecting cylinder and a radiation source ring, wherein the isolation sleeve is arranged in the cavity of the ion chamber body; the collecting cylinder is arranged in the isolation sleeve in a sleeving way; the bottom of the collecting cylinder communicates with the bottom of the isolation sleeve; both the gas inlet pipe and the gas outlet pipe penetratethrough the ion chamber body; the gas inlet pipe communicates with an annular cavity; the gas outlet pipe communicates with the cavity of the isolation sleeve; both the discharge needle electrode andthe collector are arranged on the top of the ion chamber body; the discharge needle electrode penetrates through the top of the ion chamber body and extends into the collecting cylinder; the collectorpasses through the top of