Method to analyze gas mixtures and suitable electron capture-detector to perform the method

A symmetrically cylindrical electron-capture detector suitable for direct current or pulsed operation. It is used to measure electron absorption properties of the eluate or gas mixture of a gas chromatograph or to detect an electron-negative gas, e.g. sulphur hexafluoride, in leak detectors. The collector electrode and the ionization volume defining electrode are both cylinder shaped coaxially aligned and are mechanically connected by a ceramic insulator lying between them. Inonizing radiation is produced from a titanium, scandium or nickel 63 foil as source. It ionizes the gas to be investigated flowing into the inonization volume. The coaxial space between the two electrodes should not exceed 0.32 cm. (ORU)