GeO 2 +P 2 O 5 co-doped step index multimode (SIMM) fiber having core diameter around 50 micron with numerical aperture around 0.21-0.22 proposed for the first time shows an excellent linear radiation response behaviour with sensitivity around 0.69-0.97 dB/m/100 rad at 505nm wavelength within the dose rates of 10-100 rad/hr as well as very low recovery at room temperature using 60 Co gamma radiation source. This enables its practical application in fiber optic personal dosimeter for measurement of low dose gamma radiation.
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