Their response has been very well characterized and a variety of existing software algorithms is available for isotopic composition determination tasks of U and Pu materials in safeguards applications. They benefit from the best resolution achievable nowadays yielding in the possibility to distinguish closely positioned peaks in complex spectra such as those of Pu or mixed materials. Results of our measurements and limits of the system will be presented.High-purity Germanium (HpGe) detectors have traditionally been the detectors of choice for quantitative gamma-ray spectroscopy in safeguards applications. We also applied different shielding to account for surrounding material and containers. Therefore, we performed measurements with different point sources at various distances and with different measuring times. We have investigated in the possibility of locating nuclear material with this gamma scanner. The RoSCAN can be controlled from a distance of up to 80 meters via cable.
In addition, an energy spectrum can be displayed for each field. After completion of the scan the measurement integral of each field is superimposed in different colors proportional to the gamma intensity on the optical picture. The gamma scanning area is divided into minimum 9 and maximum 1728 fields and the fields are measured sequentially. An optical (black and white) picture of the measurement situation is taken before the gamma measurement starts. The CZT spectrum can also be used to run computer codes like MGA or MGAU for the determination of the isotopic composition of nuclear material. A CsI scintillation detector with less energy resolution but more efficiency is used when a short measuring time is required. A CZT room temperature semi conductor detector is used if high resolution is crucial.
The gamma scanner is equipped with two different detectors. A gamma scan can locate the nuclear material in an object of unknown inner structure and thus help to identify its type, e.g., nuclear or radiological. A gamma scanner of type RoSCAN complements the abilities of the system. The container itself provides the necessary infrastructure, e.g., energy supply, communication means, and work places. Abstract For detection and identification of nuclear material we equipped a transportable container with neutron and gamma measurement systems.
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