Characteristics of Beta-ray Measurements of Plastic Scintillators Containing Gd2O3 or CdTe

다국어 초록 (Multilingual Abstract)

In order to determine the decontamination that is necessary to reuse sites contaminated with radioactive materials, the use of scintillation counters to measure beta radiation in the field is essential. We fabricated a casting detector by adding Gd2O3 or CdTe to a commercial organic scintillation material (0.20 PPO : 0.01 POPOP (wt%)). The transmittance of the scintillator with CdTe added was not significantly changed by the amount of added CdTe, but the transmittance of the scintillator with Gd2O3 added showed a large variation with the amount added. The scintillator with CdTe added had better transmittance than the conventional scintillator. Also, the spectra of 90Sr radiation source and background could be clearly distinguished. In addition, the detection efficiency of the plastic scintillators with CdTe was much higher than that of plastic scintillators without CdTe. Among the plastic scintillators with different concentrations of CdTe, the characteristics of the plastic scintillators with CdTe of 0.10 (wt%) were prominent. A large-scale plastic scintillator with CdTe (0.10 wt%) may be useful for assessing 90Sr contamination levels at sites contaminated by radioactive materials.

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