Abstract
At the national center for radiation emergency medicine, the first step in the radiation emergency response is early identification of unknown nuclide which might be taken in the body. In such a situation, gamma emitting nuclides are relatively easy to be identified by Ge detectors. As for beta emitting nuclides, “Pico beta” has been only commercialized installed beta ray spectrometer, which consists of a gas flow type GM counter and a plastic scintillator. However, it is difficult to carry the spectrometer outdoor because it has the thick lead gamma ray shield and also Q gas supply system. Then, the detector for a portable beta ray spectrometer with gamma ray spectrometer and alpha counter was developed aiming to evaluate unknown nuclides promptly in the locale in the emergency.
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