A New Optical Fiber Sensor for Multipoint Radiation Measurement with Sensing Regions in its Cladding

Abstract

  Current scintillating optical fibers for radiation measurement have drawbacks as high intrinsic and radiation-induced loss. In order to overcome these problems, a new optical fiber sensor for multi-point radiation measurements has been proposed with sensing regions in its cladding and in the area outside of the core. A part of the scintillation photons is trapped inside the fiber core and is transmitted to the end. The time of flight technique has been applied to the arrival time difference of the photons which are transmitted to each fiber end. Discrete radiation measurements were possible with a time resolution of 3nsec. Linearity of the measured counts has been demonstrated in a dose rate ranging between 4.2μSv and 44μSv.