Detector for measuring a radioisotope tracer gas

摘要

The present invention is a detector suitable for an apparatus for the absolute measurement of the mass flow rate of a gas by injecting a radioactive tracer isotope, with a known activity relative to a standard, into the flowing gas and measuring the activity when a small sample representative of the flowing gas is removed at a sampling point downstream of the injection point at a sufficient distance to ensure a homogeneous mixture of the tracer isotope with the flowing gas.