Simulation study on dose attenuation in optical fiber X-ray sensors
Fiber-optic X-ray sensors have attracts widespread attention due to their ability to achieve real-time and online dose measurement.Gd2 O2 S:Tb is used as scintillating material in the experiment,and Monte Carlo simulation method is used to calculate the dose attenuation caused by two fiber-optic X-ray sensors embedded with different scale of scintillating materials.And the effects of field size,water depth,and scintillating volume on dose disturbance are explored.The results show that the fiber-optic X-ray sensor embedded with scintillator with length of 7 mm and diameter of 0.7 mm exhibits significant dose attenuation at the rear of the fiber-optic,with a reduction range of depth from 5 mm to 1 mm.The dose attenuation of the fiber-optic X-ray sensor embedded with a scintillator with length of 2 mm and diameter of 0.4 mm is limited to the inside of the fiber.The dose attenuation of fiber-optic sensors is related to factors such as the volume of the scintillator,field size,and water depth,of which,volume of the scintillator is the main influencing factor.In order to reduce dose attenuation caused by sensors,volume of scintillators embedded inside the fiber-optic sensor should be limited during manufacturing process.
radiotherapyfiber-optic X-ray sensorsdose perturbationMonte Carlo simulation
NETL
NSTL
万方数据
