Acquisition of the optimum X-ray source based on multi-objective optimization model

To achieve on-site calibration of dose instruments, a calibration transmission system about `National standard metering station-Secondary standards laboratory-Position y monitor calibration' aiming at environmental dose monitoring instrument is established using filtered X-rays. In order to obtain X-ray filtered spectrum of different dose rates, properties of original spectrum with 95 kV high voltage is simulated in Geant4, and the attenuation characteristics of signal material is analyzed, on this basis, multi-objective optimization model is established for various materials, the optimum filtering condition is gotten through solving model. Finally the results of the model are verified through experiment, and it meets the national standard requirement for filtered X-ray resource. This method has significant practical value for obtaining specific doses of X-ray filtered spectrum quickly and accurately.