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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:19 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Applied Nuclear Physics
Title:
Simulation studies of the response function of a radioactive waste assay system
Authors:
Daniela Gurau (1) and Octavian Sima (2)
Affiliation:
(1)Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, P.O. Box MG-6, RO-077125, Romania
(2)Physics Department, Bucharest University, Bucharest-Magurele, P.O. Box MG-11, RO-077125, Romania
E-mail
daniela.gurau@ymail.com
Keywords:
gamma-ray spectrometry; Monte Carlo simulation; efficiency calibration; waste drums
Abstract:
The routine operation and maintenance of nuclear facilities generate quantities of radioactive material in many different matrices and forms, stored in many different sized containers. The waste is often packaged in large containers, such as 220 l drums, because process operators find drums more economical to handle than small containers. Based on regulations, the radioactivity and the radionuclide composition of the waste should be characterized before moving, shipping offsite, burying, or placing in a storage area. The most important step of the characterization process, establishing radionuclide content, is often achieved by nondestructive assay (NDA). In this work calculation techniques useful for the calibration and evaluation of measurements of radioactive waste drums by gamma-ray spectrometry were developed. In more detail, a simulation program based on GEANT 3.21 toolkit was developed to simulate the response function of ISOCART gamma-ray spectrometry system for a geometry measurement with the drum volume divided in 8 cylindrical segments delimited by equidistant planes perpendicular on the drum axis, respectively 4 tubes and an inner cylinder delimited by equally spaced cylindrical surfaces concentric with the drum axis. The Monte Carlo method was applied to obtain the spectra expected in the energy range from 50 to 2000 keV as well as the full energy peak efficiencies and the total efficiencies for sources distributed in each spatial domain resulting from the division of the volume of the drum presented above.
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