1. A method for detecting and identifying radioactive materials within the one or more containers, the method comprising: providing a background radiation data set comprising a plurality of background radiation data corresponding to a plurality of different background environments in proximity to a container; collecting, by a plurality of radiation sensors, at least one spectral data set representing radiation data associated with the container and its contents, the container being located in proximity to the plurality of radiation sensors; dynamically adjusting the collected at least one spectral data set according to at least one of the plurality of background radiation data based on a determined background environment of the plurality of different background environments in proximity to the container; spectrally analyzing the collected at least one spectral data set that has been dynamically adjusted; identifying, based on the spectrally analyzing the collected at least one spectral data set that has been dynamically adjusted, one or more isotopes associated with the contents within the container; identifying materials associated with one or more of the identified one or more isotopes; comparing the materials that have been identified to at least one manifest associated with the container, wherein the at least one manifest lists a set of materials that are declared to be within the container; and storing a set of comparison results in memory, the set of comparison results being associated with the comparing the materials that have been identified to the at least one manifest associated with the container.