We propose a ${\mathrm{GeO}}_2–{\mathrm{P}}_2{\mathrm{O}}_5$ -codoped step index multimode (SIMM) fiber having a core diameter of around $\mathrm{50}\mathrm{\mu m}$ with numerical aperture of around 0.21–0.22. The proposed SIMM fiber shows excellent linear radiation response behavior with sensitivity of around $0.69–0.97\mathrm{dB}/\mathrm{m}/100\mathrm{rad}$ at a $505\mathrm{nm}$ wavelength within the dose rate range of $10–100\mathrm{rad}/\mathrm{h}$ , as well as very low recovery at room temperature using a ${}^{60}\mathrm{Co}$ gamma radiation source. This enables its practical application in fiber optic personal dosimeters for measurement of low dose gamma radiation.

© 2011 Optical Society of America

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