Collection Efficiency of Continuous Dynode Electron Multiple Arrays

The ratio of incident electrons to electrons which participate in the multiplication process for continuous dynode electron multiplier arrays has been experimentally determined. For an array which had a geometrical transmission of 50%, it was found that 75% of the incident electron current reached the multiplication section of the array tubes. Of this percentage, 50% were considered to be initial electrons and the remaining 25% reflected or secondary electrons from the top electrode.