Si-PIN photodiode readout for a scintillating optical fiber dosimeter

For more than a decade plastic optical fiber based dosimeters have been developed for medical applications. PMT's have been widely used as the readout photodetector but for a number of applications, Si-PIN photodiodes are a good alternative. They are robust, present good stability over time and have enough sensitivity so that an electrometer can be used as a measuring device. This work describes the tests made with the S9195 Si-PIN photodiode from Hamamatsu used as the readout photodetector for a scintillating optical fiber dosimeter using a BCF-60 polystyrene optical fiber.

► Photodiode S9195 from Hamamatsu is used as a readout device for an optical fiber dosimeter.
► Doses in the mGy range were measured with the fiber dosimeter prototype.
► The S9195 photodiode signal temperature dependence was measured in the 0–50 °C range.
► A 0.2% °C−1 temperature coefficient was obtained for the 15–25 °C range and visible region.