Optimization of energy compensation layered structure of Geiger- Müller counters
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The dose rate measured by Geiger-Müller (GM) detectors plays a crucial role in assessing radiation fields. Due to the inherent characteristics of GM tubes, the energy response is inconsistent across different types or energies of radiation, leading to significant discrepancies in dose rates for radiation of the same intensity. This paper addresses the energy response differences of GM tubes and improves the spatial design of the compensation structure based on traditional shielding compensation methods. Incorporating a multi-layer compensation material model improved the uniformity of energy response across different energy levels. Monte Carlo simulations validated that the designed compensation model effectively enhances the accuracy of GM tube measurements. Initially, a perforated design was used, which improved the relative energy response by three times compared to the traditional segmented compensation method. Additionally, after applying layered compensation optimization to the lead shielding model with the perforated design, the compensation effect was further increased by 20.3 %. The final root mean square error (RMSE) of 0.429 indicates that the improved energy compensation method significantly enhances the measurement performance of GM detectors, providing more design models and optimization directions for improving the energy response of dosimeters.
Abstract
The dose rate measured by Geiger-Müller (GM) detectors plays a crucial role in assessing radiation fields. Due to the inherent characteristics of GM tubes, the energy response is inconsistent across different types or energies of radiation, leading to significant discrepancies in dose rates for radiation of the same intensity. This paper addresses the energy response differences of GM tubes and improves the spatial design of the compensation structure based on traditional shielding compensation methods. Incorporating a multi-layer compensation material model improved the uniformity of energy response across different energy levels. Monte Carlo simulations validated that the designed compensation model effectively enhances the accuracy of GM tube measurements. Initially, a perforated design was used, which improved the relative energy response by three times compared to the traditional segmented compensation method. Additionally, after applying layered compensation optimization to the lead shielding model with the perforated design, the compensation effect was further increased by 20.3 %. The final root mean square error (RMSE) of 0.429 indicates that the improved energy compensation method significantly enhances the measurement performance of GM detectors, providing more design models and optimization directions for improving the energy response of dosimeters.