研究目的
The aim of this study was to design and fabricate a windowless extrapolation chamber and to test its performance in order to access the capacity of its use for X-ray energies from 70 to 100 keV.
研究成果
The designed windowless extrapolation chamber demonstrated feasibility for use in low-energy X-ray detection, with performance characteristics meeting international recommendations. The use of graphite blocks for electrodes and elimination of the entrance window contributed to reduced leakage current and beam perturbation. Monte Carlo simulation validated the experimental results, with differences within acceptable limits. The chamber's design allows for versatility in electrode materials, making it suitable for further research.
研究不足
The study focused on X-ray energies from 70 to 100 keV, and the chamber's performance was not tested for other energy ranges. The simulation and experimental results showed differences up to 4.5%, indicating potential areas for optimization in the chamber design or simulation parameters.
1：Experimental Design and Method Selection:
The study involved the design and fabrication of a windowless extrapolation chamber for low-energy X-rays, with a focus on reducing leakage current and beam perturbation. The chamber's performance was tested through various experiments including saturation curve, ion collection efficiency, leakage current, short-term stability, polarity effect, and linearity of response. Monte Carlo simulation was also used to model the chamber and validate experimental results.
2：Sample Selection and Data Sources:
The chamber was tested with X-ray energies from 70 to 100 keV, produced by an industrial X-ray unit. Measurements were corrected to reference conditions of temperature and pressure.
3：List of Experimental Equipment and Materials:
The chamber was made of Plexiglas with graphite electrodes. The X-ray unit used was Baltospot Ceram 235 by Balteau Company. A SuperMax electrometer was used for ionization current measurements.
4：Experimental Procedures and Operational Workflow:
The chamber's performance was evaluated through saturation curve measurements, ion collection efficiency tests, leakage current measurements, short-term stability tests, polarity effect tests, and linearity of response tests. The chamber was also simulated using MCNP4C Monte Carlo code.
5：Data Analysis Methods:
Data were analyzed to determine the chamber's performance characteristics, with comparisons made between experimental and simulation results.
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