GAMMA-RAY SENSING PROBE USING CERENKOV EFFECT AND SYSTEM FOR IDENTIFYING BURNUP OF SPENT NUCLEAR FUEL ASSEMBLY USING THE SAME

摘要

Provided are a gamma-ray sensing probe using the Cerenkov effect, and a system for identifying the burnup of a spent nuclear fuel assembly using the gamma-ray sensing probes, wherein the system is established using the gamma-ray sensing probe including: an optical fiber reacting to gamma rays coming from the spent nuclear fuel assembly by the Cerenkov effect and emitting light by itself; a scatterer surrounding the optical fiber to increase light emitting efficiency of the optical fiber by the Cerenkov effect; and a collimator configured to surround the scatterer and composed of a shielding material, the collimator having a slit groove which is open in one direction, whereby the burnup of the spent nuclear fuel assembly can be accurately determined.

主权项

1. A gamma-ray sensing probe using the Cerenkov effect, that is intended to sense gamma rays coming from a gamma-ray test surface of a spent nuclear fuel assembly in order to measure the gamma rays coming from a spent nuclear fuel, the gamma-ray sensing probe comprising:
an optical fiber disposed to face a gamma-ray test surface of a spent nuclear fuel assembly in a direction perpendicular to a lengthwise direction of the spent nuclear fuel assembly, the optical fiber reacting to gamma rays coming from the gamma-ray test surface and emitting light by the Cerenkov effect; a scatterer extending to the extent of a length of the gamma-ray test surface and formed to surround an outer circumferential surface of the optical fiber, the scatterer reacting to gamma. rays incident from the gamma-ray test surface of the spent nuclear fuel assembly to the optical fiber and causing Compton scattering; and a collimator surrounding an outer circumferential surface of the scatterer and composed of a shielding material, the collimator having a slit groove formed at one side thereof, thereby passing only gamma rays coming from a part of the gamma-ray test surface, for which measurement is required, through the scatterer.