Development of compact sensor with CdS photoresistor for high gamma-ray field monitoring

A compact gamma-ray sensor composed of a cadmium sulfide (CdS) photoresistor and a small-sized cesium iodine doped thallium scintillator is introduced for intense gamma-ray monitoring. The sensor exhibits radiation-resistant ability and a linear output response over a wide dose range. The dose rate at several conditions was measured for confirmation of feasibility. Experimental results demonstrated its advantage for gamma-ray measurements in intense fields as an inexpensive, robust, compact, and high-sensitivity device.