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Absolutely Calibrating an Energy Dispersive Detector

Absolutely Calibrating an Energy Dispersive Detector. Patrick Ross Spring Research Conference. Why?. Absolute Calibration provides more information. Applications in Medical Research Materials Science Use in material analysis (X-Ray Diffraction/ X-Ray Florescence). Our Detector.

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Absolutely Calibrating an Energy Dispersive Detector

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  1. Absolutely Calibrating an Energy Dispersive Detector Patrick Ross Spring Research Conference

  2. Why? • Absolute Calibration provides more information. • Applications in Medical Research • Materials Science • Use in material analysis (X-Ray Diffraction/ X-Ray Florescence)

  3. Our Detector

  4. CCD: A spacially resolving detector

  5. Methods of Calibration We are attempting to calibrate the detector using a calibrated source (±5%). We confirmed the source’s calibration with: • Proportional Counter • PIN Diode

  6. Proportional Counter

  7. Problems with the Proportional Counter • Obscure geometry of detector • Pressure problems (P-10 Gas) • Solid angle problems (measuring the depth of the window)

  8. PIN Diode

  9. Calibrating the CCD Detector 1 X-ray source Detector 2

  10. So, how is a CCD an energy dispersive detector? It isn’t, But…

  11. Von Hamos Spectrometer

  12. Von Hamos Spectrometer Single Crystal θ θ’ λ λ’ CCD

  13. Increasing the Signal to Noise Von Hamos spectrometer disperses according to wavelength. With the energy calibration, background counts can be eliminated.

  14. Thanks to: • Dr. Larry Knight • Sterling Cornaby • Arturo Reyes • Quan Wang • Moxtek, Inc.

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