Ultra-low background gas-filled alpha counter

摘要: A method and counter for reducing the background counting rate in gas-filled alpha particle counters wherein is constructed such a manner as to exaggerate differences features preamplifier pulses generated by collecting charges ionization tracks produced particles emanating from different regions within then using pulse feature analysis recognize these so discriminate between of emanation. Thus emitted sample can be counted while those components rejected, resulting very low rates even large samples. In one embodiment, multi-wire chamber, electric fields are created resultant difference electron velocities during charge collection allow backwall distinguished. second parallel-plate dimensions adjusted that times much longer caused source than anode particles. both embodiments guard electrode placed about anode's perimeter secondary performed on signal output attached this further identify reject counter's sidewalls order lower background.