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A compact gamma spectrometer was developed by employing an in-house grown single crystal of Gd 3 Ga 3 Al 2 O 12 :Ce,B scintillator optically coupled with a silicon photodiode. The performance of the detector was characterized in detail. The detector setup works with a low bias voltage of 9 V, drawn from a single battery. Power to the electronic components of the entire system is derived from a single universal serial bus port by employing required DC-DC converters. In addition to the low voltage operation, this developed spectrometer is very compact in size compared to the one developed by employing photo-multiplier tubes. The system offers excellent linearity over the gamma energy range of 344-1408 keV and an optimum energy resolution of about 13% at 662 keV.

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