high energy x-ray detection by micropattern gaseous detector

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.