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Environmental radioactivity measurement in high–dose areas

These researchers used a Kromek GR1 to measure isotope levels in deeply contaminated areas in the Fukushima region following the breakdown of the nuclear reactor.

Environmental radioactivity measurement in high–dose areas using a GR1 CZT gamma detector

Abstract

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.

Air kerma rates were estimated by the same pulse height spectra for determining surface deposition density on soil for radio-caesium. Estimated results showed almost the same values as obtained by the NaI(Tl) scintillation survey meter. The results indicate that the CZT detector can be applied to rapid and simple in situ gamma-ray radioactivity measurement in higher–dose rate areas whose dose rates exceed several tenth Sv h1.

The study also strongly supports that the CZT detector is one promising candidate for the detector to be used for checking the effect of decontamination works and for long-term monitoring in heavily contaminated areas.

The full research paper on environmental radioactivity measurement in high–dose areas can be found in the link below.

Gamma ray radiation detector spectrometer CZT based

GR1 Standard gamma-ray spectrometer

Perfect for most uses

  • Energy resolution: < 2.5% FWHM @ 662 keV.
  • USB output only.
  • 1 cm cubed CZT detector.

GR05 gamma-ray spectrometer

For use in a high-flux environment

  • Energy resolution: < 2.5% FWHM @ 662 keV
  • USB output.
  • Smaller 0.5 cm cubed CZT detector.
  • For use in high-count (high-flux) environments.

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