09 Universal curve of Gth

09 2004 Universal curve of thermal neutron self-shielding factors (foils, wires, spheres, cylinders)

The interpretation of the sample activation in a nuclear reactor requires the knowledge of two corrective parameters: the thermal neutron self-shielding factor, Gth, and the resonance neutron self-shielding factor, Gres. The authors established a universal curve of Gres for isolated resonances and various geometries. The present paper deals with the description of Gth in foils, wires, spheres and cylinders by means of a universal curve on the basis of a dimensionless variable which includes the physical, nuclear and geometrical properties of the sample. The universal curve is in good agreement with the experimental and calculated values obtained from the literature.

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