New Techniques in Precision Gamma ScanningnApplication to Fast-Breeder Reactor Fuel Pins

摘要

A new precision gamma scanning system is described. The system is designed for the thorough, detailed, nondestruc¬tive characterization of irradiated fast reactor fuel pins. Gamma scanning data are given for failed fuel pins, transfer mechanisms of fission products, quantitative isotopic scan¬ning, and differential burnup profiles.nThe system consists of a scanning mechanism for the precise positioning (±0.001 in.) of the irradiated fuel pin, high density tungsten alloy collimators for defining the volume segment from which the gamma-ray spectra are collected, a large high-resolution anticoincidence detector assembly for resolving complex gamma-ray spectra, and a computer con-trolled data acquisition unit with magnetic tape storage for processing and storing the gamma-ray spectra.