| 摘要 |
<p>An asymmetric cylinder electron capture detector comprises a cylindrical electrode configured to define an ionization volume, a source of ionizing radiation disposed within the ionization volume, a cylindrical collector electrode, the respective cylindrical electrodes being in coaxial alignment but having their ends spaced apart, means for directing a gas past the collector electrode into the ionization volume, and means for applying a difference of electrical potential between the electrodes. The two electrodes are mechanically connected via an intermediately disposed cylindricaly insulator cylinder. The collector electrode is received in one end of the insulator cylinder, and the electrode defining the ionization volume is received within the other end of the insulator cylinder. The collector electrode has an elongate portion extending into the interior of the insulator cylinder, but spaced apart from the inner surface of the insulator cylinder. The elongate portion of the collector electrode may extend into the insulator cylinder up to a position coplanar with the end of the electrode defining the ionization volume. The insulator cylinder provides a flow path from the collector electrode to the ionization volume and permits turbulence to be introduced into gas flow by means of a transverse gas exit port.</p> |
