Development of a New CdTe Area Radiation Monitor using the G(E) Function Method

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We developed a small Area Radiation Monitor (ARM) prototype with high accuracy performance by combining a cadmium telluride (CdTe) detector with the G(E) function method. To obtain the measurement accuracy required for ARMs, we created a G(E) function based on detailed spectral responses. The accuracy of the derived dose rate and other expected requirements for practical applications were experimentally evaluated. The accuracy for a CdTe detector with dimensions of 5×5×5 mm 3 was within 14% in the 60-300keV range and within 10% in the 300keV-1.8 MeV range, which was comparable to a large ARM with an ionization chamber. The accuracy for a CdTe detector with dimensions of 2×2×2 mm 3 was within 23% in the 60-300 keV range and within 14% in the 300keV-1.8MeV range, which was inferior to the 5×5×5 mm 3 detector but higher than a small ARM using a silicon PIN photodiode.

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