High Energy X-Ray Detection by MicroPattern Gaseous Detector

• Published in: Frontiers in biomedical technologies Vol. 12; no. 1
• Main Authors: Khezripour, Saeedeh, Rezaie Rayeni Nejad, Mohammad Reza
• Format: Journal Article
• Language: English
• Published: Tehran University of Medical Sciences 01.12.2025
• Subjects: D2O; Gas Detector; High Energy X-Ray; Micromegas; Monte Carlo N Particle X-Version Code; Photoneutron
• ISSN: 2345-5837; 2345-5837
• DOI: 10.18502/fbt.v12i1.17742

Purpose: The paper aims to discuss the response of the Micro-Mesh Gaseous Structure (Micromegas) detector to high-energy X-ray with 2.3 MeV energy using photon to neutron converters in addition to optimization of the detector components by Monte Carlo simulation. Materials and Methods: Methods of using Micromegas are different in terms of energy and intensity of high-energy X-ray. Response of Micromegas detector to X-ray with 2.3 MeV by different photoneutron converters was calculated by Monte Carlo N Particle X-Version (MCNPX) code. The number of electrons in the drift and multiplication regions and the depth-dose in the various regions of the detector were measured to study the response of the Micromegas detector to high energy X-ray. Also, the thickness of the upper electrode, and the type of gas in the detector were studied and optimized. Results: D2O with 2×10-5 efficiency is the best target to convert photons with 2.3 MeV energy to neutrons. It is the proper convertor to change the high energy X-ray into a photoneutron that can be detected by Micromegas. The optimum thickness of the upper electrode is 0.0026 cm for air and P10 gas in the detector. Conclusion: The results show that this detector can detect high-energy X-rays with energy above 2 MeV. The Monte Carlo results showed the output current of the Micromegas detector is 5.12 pA per one input hard X-ray photon.