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Oral presentation

Development of position assessment methods for atmospherically-released radioactivity, 1; Position assessment using an unfolding method

Ishizuka, Akihiro; Nozaki, Tatsuo; Kokubun, Yuji; Okubo, Koichi; Torii, Tatsuo; Takata, Takushi*; Kume, Kyo*; Hasegawa, Takashi*; Sugita, Takeshi*

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The assessment methods of types and distributions of a radioactivity unexpectedly released to atmosphere from nuclear power plants have been studied with a help of examination of data measured by $$gamma$$-ray detectors at several radiation monitoring equipments. The principle was verified with a $$gamma$$-ray source in room, and an existing nuclear power station was simulated as an application example.

Oral presentation

Development of position assessment methods for atmospherically-released radioactivity, 2; Implementation for higher count rate situations

Takata, Takushi*; Ishizuka, Akihiro; Nozaki, Tatsuo; Kokubun, Yuji; Okubo, Koichi; Torii, Tatsuo; Kume, Kyo*; Otani, Nobuo*; Hasegawa, Takashi*

no journal, , 

The assessment methods of a radioactivity distribution unexpectedly released to atmosphere from nuclear power plants have been studied using a single channel analyzing technique. A combination of this single channel analyzing technique and a detector sensitive to a solid angle of an incident $$gamma$$-ray was examined to assess the same purpose.

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