1. A method for identifying a likelihood of detecting objects, the method comprising: identifying a number of objects using a processor unit; identifying a number of densities associated with each of the number of objects using a number of chemical elements associated with the each of the number of objects; determining the likelihood of detecting each of the number of objects with a backscatter x-ray system, in which the likelihood is determined using the number of densities and an atomic number associated with the each of the number of objects; and generating a three-dimensional diagram of the likelihood of detecting each of the number of objects with the backscatter x-ray system.