Techniques for Two-Dimensional Gamma-Ray Scanning of Reactor Fuel Element Sections

Two-dimensional gamma scanning has been developed to supplement linear gamma scanning and microsampling in determining the spatial distributions of radioactive isotopes in reactor fuel elements. The techniques used in the twodimensional scanning are discussed. These include sample preparation, collimator design, spatial resolution, detector systems, data analysis, and data presentation. Examples of the type of results which can be expected from the techniques are given and future developments are discussed.