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

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Presentation transcript:

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) Use in material analysis (X-Ray Diffraction/ X-Ray Florescence)

Our Detector

CCD: A spacially resolving detector

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

Proportional Counter

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

PIN Diode

Calibrating the CCD X-ray source Detector 1 Detector 2

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

Von Hamos Spectrometer

Single Crystal CCD λ λ’λ’ θθ’θ’

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

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