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The application of a high purity germanium (HPGe) gamma spectrometer indetermining the fuel element burnup in a future reactor is studied. The HPGedetector is exposed by a Co60 source with varying irradiation rate from 10 kcpsto 150 kcps to simulate the input counting rate in real reactor environment. ACs137 and a Eu152 source are positioned at given distances to generate certainevent rate in the detector with the former being proposed as a labeling nuclideto measure the burnup of fuel element. It is shown that both the energyresolution slightly increasing with the irradiation rate and the passthroughrate at high irradiation level match the requirement of the real application.The influence of the background is studied in different parameter sets used inthe particularly developed procedure of the background subtraction. It isdemonstrated that with the typical input irradiation rate and Cs137 intensityrelevant to deep burnup situation, the precision of the Cs137 counting rate inthe current experiment is consistently below 2.8%, indicating a promisingfeasibility of utilizing an HPGe detector in the burnup measurement in futurebed-like reactor.

Conditioning the gamma spectrometer for activity measurement at very high background