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Charged Particle Interactions - Detection

Charged Particle Interactions - Detection. Interaction of heavy charged particles Electronic or nuclear (Rutherford, nuclear reactions, …). Detectors mainly designed to make use of electronic interactions.

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Charged Particle Interactions - Detection

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  1. Charged Particle Interactions - Detection • Interaction of heavy charged particles • Electronic or nuclear (Rutherford, nuclear reactions, …). Detectors mainly designed to make use of electronic interactions. Excitation Ionization ion-pair, suppress recombination in detectors. Energy loss SRIM http://www.srim.org • Depletion layer. • Delta rays and secondary electrons. • Electron suppression for charge integration. • Faraday Cup. • Tracks. Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  2. Charged Particle Interactions - Detection Stopping power Bethe-Bloch formula ~1/E Minimum ionizing particles Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  3. Charged Particle Interactions - Detection What about fission fragments????? • Energy loss is a stochasticprocess, thus energy straggling. ~1/E Electron pick-up. Bragg curve Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  4. Charged Particle Interactions - Detection Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  5. Charged Particle Interactions - Detection Units (conversion) You will encounter this when you run SRIM eV / Å keV / m MeV / mm keV / (g/cm2) MeV / (mg/cm2) keV / (mg/cm2) eV / (1x1015 atoms/cm2) Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  6. Charged Particle Interactions - Detection Range of charged particles Compare to gamma … !!! Range straggling? • An “old” idea to measure energy..! • Surface barrier, PIPS. • For a detector to register the full energy of charged particles, its thickness should be more than the range at that energy. • Sometimes we look for partial energy. • E-E detection. • Energy and position sensitive detectors. • Radioactive ion beams. Counts number Mean and extrapolated range. Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  7. Charged Particle Interactions - Detection Energy deposited in an absorber (or detector). Or, if “thin” absorber: Both are not accurate. Why? You can do it better with SRIM. Use SRIM Data to reproduce the graphs. Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  8. Charged Particle Interactions - Detection Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  9. Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  10. Charged Particle Interactions - Detection E-E detection. Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  11. Charged Particle Interactions - Detection Stopping time Problem…!! • Effect on Doppler shift and broadening in nuclear reactions. Compare the application of scaling laws and Bragg-Kleeman rule with SRIM. Work out many examples. Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  12. Charged Particle Interactions - Detection • Fast Electron Interactions. • Collisional • Radiative (Bremsstrahlung) What is the main difference for positrons? Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  13. Charged Particle Interactions - Detection Range .. ! Monoenergetic Range x density What about  electrons? Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  14. Charged Particle Interactions - Detection Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

  15. Charged Particle Interactions - Detection Backscattering • Detector entrance window or dead layer. • Source backing. Fraction backscattered Radiation Detection and Measurement, JU, 1st Semester, 2008-2009 (Saed Dababneh).

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