A multiwire proportional counter for XAS fluorescence experiments.

Area of Science:

• Atomic and Molecular Physics
• Materials Science
• Instrumentation and Measurement

Background:

• X-ray absorption spectroscopy is a powerful technique for elemental analysis.
• Traditional detectors like Si(Li) and NaI(Tl) have limitations in high count rate applications.
• Multiwire proportional counters (MWPCs) offer potential advantages in speed and active area.

Purpose of the Study:

• To evaluate the performance of a multiwire proportional counter (MWPC) for fluorescence X-ray absorption measurements.
• To compare the MWPC's capabilities against established Si(Li) and NaI(Tl) detectors.
• To assess the impact of counting rate on detector performance.

Main Methods:

• Experimental setup utilizing a multiwire proportional counter (MWPC) for X-ray absorption measurements.
• Comparative analysis of the MWPC against Silicon Lithium (Si(Li)) and Sodium Iodide Thallium-activated (NaI(Tl)) detectors.
• Measurements conducted across a range of X-ray counting rates.

Main Results:

• The MWPC demonstrated suitability for fluorescence X-ray absorption analysis.
• MWPC performance improved relative to Si(Li) detectors as counting rates increased.
• At medium counting rates (up to 10^5 counts/s), the MWPC showed comparable response to NaI(Tl) detectors.

Conclusions:

• Multiwire proportional counters are a viable alternative for X-ray absorption measurements, particularly in high count rate scenarios.
• The MWPC's large active area and high counting rate capability make it advantageous for specific applications.
• Further studies can explore the MWPC at its maximum counting rate capability for advanced applications.