Environmental radioactivity measurement in high–dose areas

For the purpose of determining a surface deposition density on soil for radio-caesium, a CdZnTe (CZT) semiconductor detector whose crystal has dimensions of 1 cm cubic was applied to the in situ environmental radioactivity measurement in deeply contaminated areas in Fukushima region.

Even in high–dose rate areas where pulse height spectra weren’t able to be properly obtained by the conventional high-purity Ge (Hp-Ge) semiconductor detector, proper pulse height spectra were obtained by the CZT detector with certain accuracy. Results of deposition density on soil for 134Cs and 137Cs derived from net peak areas by the CZT detector seemed consistent, compared with those measured by the Japanese government.

Kromek Group plc designs, develops and produces x-ray and gamma-ray imaging and radiation detection products for the medical, CBRNe security, Homeland Security and civil nuclear radiation detection markets. 

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