Figure 8   Gas Ionization Curve

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PROPORTIONAL COUNTER Radiation Detectors Figure 8 illustrates how the number of electrons collected varies with the applied voltage. Figure 8   Gas Ionization Curve When a single gamma ray interacts with the gas in the chamber, it produces a rapidly moving electron which produces secondary electrons.  About 10,000 electrons may be formed depending on  the  gas  used  in  the  chamber.    The  applied  voltage  can  be  increased  until  the  amount  of recombination is very low.   However, further increases do not appreciably increase the number of electrons collected.   This region in which all 10,000 electrons are collected is the ionization region. As applied voltage is increased above 1000 V, the number of electrons becomes greater than the initial  10,000.   The  additional  electrons  which  are  collected  are  due  to  gas  amplification.   As voltage is increased, the velocity of the 10,000 electrons produced increases.   However, beyond a  certain  voltage,  the  10,000  electrons  are  accelerated  to  such  speeds  that  they  have  enough energy to cause more ionization.   This phenomenon is called gas amplification. IC-06 Page 20 Rev. 0


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