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Absolute Calibration of Energy Dispersive Detectors for Advanced Material Analysis

Learn about the thorough process of calibrating Energy Dispersive Detectors for precise measurements in Medical Research and Materials Science. Utilizing a CCD detector, delve into the methods and challenges of calibration, including issues with Proportional Counters and PIN Diodes. Discover how Von Hamos Spectrometers enhance signal-to-noise ratio by dispersing based on wavelength, with contributions from experts in the field.

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Absolute Calibration of Energy Dispersive Detectors for Advanced Material Analysis

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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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