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Pyroelectric detectors offer advantages for X-ray detection at synchrotrons. This study presents an improved method to measure their responsivity in the hard X-ray region, crucial for accurate measurements.

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Area of Science:

  • Physics
  • Materials Science
  • Instrumentation

Background:

  • Pyroelectric detectors are versatile tools for infrared and X-ray detection.
  • Their application in hard X-ray regions necessitates understanding absorption effects.
  • Accurate responsivity measurement is vital for reliable X-ray detection.

Purpose of the Study:

  • To develop an improved experimental setup for measuring pyroelectric detector signals in the hard X-ray region.
  • To accurately determine the responsivity (V/W) of pyroelectric detectors for absorbed hard X-ray radiation.
  • To validate the performance of pyroelectric detectors against ionization chambers for X-ray absorption fine structure measurements.

Main Methods:

  • An improved experimental setup was designed and implemented for hard X-ray measurements.
  • Responsivity measurements were conducted using a lithium tantalate (LiTaO3) pyroelectric detector.
  • K-edge X-ray absorption fine structure (XAFS) of copper and nickel foils was measured and compared with ionization chamber data.
  • Absorption spectra near tantalum (Ta) L-edges in LiTaO3 were measured with the crystal acting as both sample and sensor.

Main Results:

  • The responsivity of pyroelectric detectors in the hard X-ray region was successfully measured.
  • XAFS measurements using the LiTaO3 detector showed good agreement with ionization chamber results.
  • The study demonstrated the feasibility of using LiTaO3 as both a detector and a sample for X-ray absorption spectroscopy.

Conclusions:

  • The improved setup enables accurate responsivity measurements for pyroelectric detectors in the hard X-ray range.
  • Pyroelectric detectors are reliable sensors for X-ray absorption fine structure studies.
  • Lithium tantalate pyroelectric detectors show potential for dual use as detectors and samples in X-ray spectroscopy.