These customers used a heavily shielded GR1 to measure the Radioactivity levels in a building at the Fukushima Daiichi power station
These customers used a heavily shielded GR1 to measure the radioactivity levels in a building at the Fukushima Daiichi Power station.
The Kromek GR1 is a range of CZT-based high-performance Gamma Ray wSpectrometers. They are completely self-contained, with a built-in preamplifier, shaping amplifier, baseline restorer, pulse height digitizer, and HV supply. The digitized pulse heights of detected gamma-ray signals are sent to a PC via the USB. The unit is powered entirely from the USB bus, so no external power supply is needed.
Photon energy spectra were measured above the operating floor of unit 3 reactor at the Fukushima Daiichi Nuclear Power Station by using a Kromek GR1 CZT (CdZnTe) Gamma Ray Spectrometer. The GR1 Spectrometer was installed in a lead collimator to measure the photons from the area directly below the detector. The collimator and spectrometer were lifted up by a crane and set above the operating floor. The photon spectra were derived by unfolding the pulse height spectra measured using the spectrometer. The response function of the spectrometer was calculated with the MCNP-4C code and was used as an input parameter of the unfolding code MAXED. It was found from the photon energy spectra that low-energy photons with energy below 0.4 MeV were dominant above the operating floor. These spectra are fundamental data for evaluating the dose reduction effect by setting up shields on the operating floor.
TANIMURA, Yoshihiko & Hirayama, Hideo & KONDO, Kenjiro & NAGATA, Hiroshi & IWANAGA, Kouhei & SUZUKI, Seishirou. (2016). Photon Spectra Measured above Operating Floor of Unit 3 Reactor at Fukushima Daiichi Nuclear Power Station. Transactions of the Atomic Energy Society of Japan. 15. 10.3327/taesj.J16.001.
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