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Voltage division circuit for a photomultiplier tube

  • US 5,880,457 A
  • Filed: 06/16/1997
  • Issued: 03/09/1999
  • Est. Priority Date: 06/14/1996
  • Status: Expired due to Fees
First Claim
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1. A voltage division circuit for a photomultiplier tube which includes:

  • a photocathode which emits photoelectrons in response to light incident thereon;

    a first dynode portion having at least one dynode, said first dynode portion receiving the photoelectrons emitted from said photocathode, multiplying the photoelectrons and emitting multiplied photoelectrons;

    a second dynode portion having at least one dynode, said first dynode portion receiving the multiplied photoelectrons emitted from said first dynode portion, multiplying the multiplied photoelectrons and emitting further multiplied photoelectrons;

    a third dynode portion having two or more dynodes, said third dynode portion receiving the multiplied photoelectrons emitted from said second dynode portion and emitting further multiplied photoelectrons; and

    an anode receiving the further multiplied photoelectrons emitted from said third dynode portion,a voltage division circuit which supplies relevant voltages to said photocathode, said first dynode portion, said second dynode portion, and said third dynode portion, comprising;

    a first voltage division portion which is applied with a first side potential and a second side potential higher in voltage than the first side potential defining a high voltage and outputs voltages applied to said first dynode portion and said third dynode portion upon voltage dividing the high voltage at a predetermined voltage division ratio; and

    a second voltage division portion which is applied with the first side potential and the second side potential of the high voltage and outputs a voltage applied to said second dynode portion upon voltage dividing the high voltage at a variable voltage division ratio.

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