Detection of Illicit Nuclear Materials Masked with other Gamma-Ray Emitters
The purpose of this work was to experimentally determine the extent to which legal shipments of radioisotopes could be used to mask the presence of illicit nuclear materials and the means by which this can be accomplished.
Application of Nucleonica's Gamma Spectrum Generator and easyMonteCarlo simulation tools on nuclear security issues
Modeling of gamma spectra is required in various fields. The growth of usage of spectrometric border monitoring methods to combat illicit trafficking of nuclear and other radioactive materials enhances the need for such techniques. With the development of the Gamma Spectrum Generator within the Nucleonica web-portal (www.nucleonica.net) a new ansatz is made, which allows authorized experts to perform spectrum modeling on a PC, wherever web access is available. The spectrum modeling toolkit (Gamma Spectrum Generator and easyMonteCarlo) must address various aspects, such as different detectors and their direct environment, various radioactive sources, their geometries and materials, distances and absorbers. After showing the accuracy of the modeling tools, more sophisticated scenarios can be dealt with. As a first example the nuclear security relevant masking issue is investigated experimentally and in extensive simulations using the described modeling tools.
An empirical function which relates the slope of the Ge(Li) efficiency curves and the active volume
Abstract By using experimental data from some Ge(Li) detectors, an empirical function which relates the slope of the efficiency curves to the active volumes has been adjusted. With this function, the efficiency decrease with energy increase can be predicted for each particular detector within an error less than 3%.