Assessment of the flux and monochromaticity characteristics of a polarized X-ray source
This paper presents an apparatus designed for the generation of polarized X-rays utilizing crystal Bragg diffraction techniques, which produces polarized X-rays energies within the range of 4-10 keV, facilitating the calibration of detection efficiency, energy resolution, polarization degre...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
VINCA Institute of Nuclear Sciences
2024-01-01
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| Series: | Nuclear Technology and Radiation Protection |
| Subjects: | |
| Online Access: | https://doiserbia.nb.rs/img/doi/1451-3994/2024/1451-39942404251L.pdf |
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| Summary: | This paper presents an apparatus designed for the generation of polarized
X-rays utilizing crystal Bragg diffraction techniques, which produces
polarized X-rays energies within the range of 4-10 keV, facilitating the
calibration of detection efficiency, energy resolution, polarization degree,
and other parameters pertinent to polarized X-ray detectors. The apparatus
comprises of a radiation source, a diffractive crystal, a rotating control
mechanism, a detector and other components. High-precision generation of
polarized X-rays can be achieved by diffracting through crystals with varying
lattice constants at an angle of 45° using an X-ray tube and a Bragg
diffraction apparatus. Monte Carlo simulations were conducted to evaluate air
absorption effects on X-rays at varying energy levels, revealing an optimal
measurement distance of 30 cm. Key metrics such as energy output, flux rate,
energy resolution and mono-chromaticity for the generated polarized X-rays
were evaluated through experimental measurements. The polarized X-ray flux
rates were measured as: 4.135×106 m-2s-1 at 4.59 keV, 2.210×107 m-2s-1 at
6.39 keV, and 1.958×107 m-2s-1 at 10.029 keV. Monochromaticity values were:
1.48 % at 4.59 keV, 0.96 % at 6.39 keV, and 0.15 % at 10.029 keV. The
apparatus is applicable to ground calibration of astronomical satellite
payloads and detector development. |
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| ISSN: | 1451-3994 1452-8185 |