Gamma-ray sensing probe using cerenkov effect and system for identifying burnup of spent nuclear fuel assembly using the same

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.