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[2H20] Feasibility study on high dose rate gamma-ray spectrometer using unfolding method
Keywords:gamma-ray spectrometry, unfolding, CdTe semiconductor detector, high dose rate, charge carrier trapping phenomena
In order to consider operational procedure for decommissioning of Fukushima Daiichi nuclear power plant, it is necessary to know not only contamination distribution but also nuclide composition. However, it is difficult to measure gamma-ray spectra for nuclide identification due to the pulse pile-up phenomena in high dose rate. We try to restore gamma-ray spectra by unfolding the output of extremely small detector without pulse pile-up phenomena. Response functions of several mm cubic CdTe detectors were calculated using Monte-Carlo code EGS5. The experiment results were reproduced correctly by taking into account charge carrier trapping phenomena specific to CdTe. The experiment results of Cs-137 etc. were unfolded, and their results indicate that we have acquired the potential to restore distinct energy peaks.
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