Research on a tunable monochromatic X-rays source in (5∼40) keV

Area of Science:

• X-ray physics
• Detector calibration
• Monochromatic X-ray generation

Background:

• Bragg diffraction offers continuously adjustable energy for monochromatic X-rays.
• Accurate calibration of detection efficiency requires a stable X-ray beam position.

Purpose of the Study:

• To establish a monochromatic X-ray facility for (5-40) keV energy range.
• To develop a system with a stable X-ray beam position during Bragg angle adjustment.
• To accurately calibrate detector efficiency.

Main Methods:

• Utilized Bragg diffraction with a crystal monochromator and a synchronous rotating device.
• Invented a new mechanical structure linking the crystal and X-ray tube for stable beam output.
• Employed Monte Carlo simulations to model and optimize a silicon drift detector.
• Calibrated detection efficiency using standard radiation sources.

Main Results:

• Developed a monochromatic X-ray facility covering (5-40) keV.
• Achieved a stable monochromatic X-ray beam position by rotating the X-ray source at 2θ relative to the crystal's Bragg angle θ.
• Obtained an accurate silicon drift detector model and calculated its detection efficiency curve.
• Validated the system's energy range, flux, monochromaticity, and spot distribution.

Conclusions:

• The developed facility provides a reliable source of tunable monochromatic X-rays.
• The novel mechanical linkage ensures beam stability crucial for precise detector calibration.
• The optimized detector model and calibration method enhance the accuracy of photon flux measurements.