Studies on Ceramic Fuels with the Use of Fission Gas Release Loop, (III)

Neutron Flux Monitoring in Specimen Chamber of FGRL by Counting Nitrogen-16 Generated ¹⁶O(n, p) ¹⁶N Reaction in Primary Cooling Water

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Flux monitoring in the specimen chamber of FGRL was carried out by directly and continuously reading with a γ-ray spectrometer the content of ¹⁶N in the primary cooling water produced by ¹⁶O(n, p)¹⁶N reaction within the cooling jacket of FGRL. ¹⁶N generation is not influenced by γ-ray build-up in the reactor nor by the temperature in the specimen chamber. The detector can be simply set outside the pipe through which the cooling water flows, because the high energy γ-rays (6.13MeV) emitted during the ¹⁶N decay easily penetrate the pipe wall.