Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A

Quenching
As positive ions are collected after a pulse, they give up their kinetic energy
by striking the wall of the tube; Ultraviolet photons and/or electrons are
liberated, producing spurious counts. Prevention of such counts is called
quenching. Quenching may be accomplished electronically (by lowering the
anode voltage after a pulse) or chemically (by using a self-quenching gas).
■ Electronic Quenching (by lowering the anode voltage after a pulse)
Electronic quenching is accomplished by introducing a high value of
resistance into the voltage circuit. This will drop the anode potential until all
the positive ions have been collected.
Charlie Chong/ Fion Zhang