Lecture16 - ENU 4612C/5615C Nuclear Radiation Detection and...

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Unformatted text preview: ENU 4612C/5615C Nuclear Radiation Detection and Instrumentation Lecture 16 Geiger-Mueller Counters Gas-Filled Detectors 2. Geiger-Mueller Counters Geiger-Mueller Counters • The Geiger discharge • Quenching • Time behavior • Counting plateau • Detection efficiency Gas multiplication “Townsend Avalanche” Townsend Avalanche dx n ⋅ = ⇒ ⋅ = α α n dn dx dn : equation Townsend growth l exponentia have we and n(x) Therefore, x e n α = Threshold for gas multiplication E α Computer-Simulated Avalanche single electron anode wire 25 μm Avalanche Propagation Cathode Wall Anode UV photons Avalanche Propagation Counter) M- (G n propagatio unlimited" "- 1 ' counter) nal (proportio t unimportan n propagatio- 1 ' avalanche another form to elsewhere interacts photon UV ical y that typ probabilit p avalanche / photons UV emitting atoms excited of number ' >> << = = p n p n n • Buildup of the positive ion sheath: • Resulting space charge terminates the “Geiger discharge” Avalanche Propagation Cathode •...
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This note was uploaded on 12/10/2011 for the course ENU 4612c taught by Professor Ghita during the Fall '11 term at University of Florida.

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Lecture16 - ENU 4612C/5615C Nuclear Radiation Detection and...

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