Lecture15 - ENU 4612C/5615C Nuclear Radiation Detection and...

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ENU 4612C/5615C Nuclear Radiation Detection and Instrumentation Lecture 15 Ionization Chambers
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Major Detector Categories Gas-filled Scintillation Semiconductor Miscellaneous
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Gas-Filled Detectors 1. Ionization Chambers 2. Geiger-Mueller Counters 3. Proportional Counters
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Gas-Filled Detectors 1. Ionization Chamber
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Ionization Chambers The ionization process in gases Charge migration and collection Pulse mode operation
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The Ionization Process fast charged particle free electron positive ion “ion pair”
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Results of Collisions “negative ion” e e Charge transfer: Electron attachment: Recombination:
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Recombination + = n n dt dn α Columnar: (along individual particle track) Bulk: (ion and/or electrons from independent tracks)
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Typical W – Values (in eV/ion pair) electrons protons Alphas Air 33.8 35.2 35.1 Ar 26.4 26.7 26.3 CO 33.0 34.4 34.2 1 MeV 30,000 ion pairs formed pairs ion of number particle charged by lost energy = W
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Lecture15 - ENU 4612C/5615C Nuclear Radiation Detection and...

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