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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:37 |
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Conference: Bucharest University Faculty of Physics 2022 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Simulation and measurement of gamma-ray activity for
U-Ore & Th-Ore samples at various ages
Authors:
Ciprian COSAR (1)
*
Affiliation:
1)Faculty of Physics, University of Bucharest, Str. Atomiştilor, nr.405, 077125, Măgurele, Ilfov, România
E-mail
ciprian.cosar@drd.unibuc.ro
Keywords:
Uranium, Thorium, MCNP, Fitzpeaks
Abstract:
We investigate the natural occurring of daughter nuclei of two nuclear families (U-234, U-235, U-238 & Th-232 sample isotopes taken into account), we taken into consideration a periods of 1, 5, 10, 25, 50 years for the secular equilibriums. We intended to develop a new and better way for characterization of uranium and thorium ore samples.
Gamma-ray activity measurement of pure Thorium & Uranium natural occurring ore samples at different ages, combined with efficiency, coincidence summing correction. Samples of both U and Th have been placed at 5 cm and all initial activity have been set for 100.000 Bq. Total counting of spectra has been taken into account in order to compare between ages of the ores.
MCNP a Monte Carlo simulation code was employed in simulating the data, then EFFTRAN code was employed for coincidence gamma correction, Fitzpeaks was used to analyze the photopeaks present and obtain the activity of each principal photopeak.
The method can be used in conjunction with other methods to accurately determine the age of samples based on the activity of daughter nuclides and possible to determine the amount of Uranium or Thorium present.
Fitzpeaks is of great addition for gamma-ray spectroscopy and metrology as a tool, its easy to manipulate gamma-ray spectra. The advantage of MC simulations are that you can simulate U-234 which in real samples are very difficult to trace.
Based on the U-234 activity detected we can obtain clear data about how enriched is the sample, providing a tool for nuclear forensics.
References:
R. Stochici, I. Radulescu, A. Blebea-Apostu, The Analysis of the Natural Radioactivity Anomalies of the Menilites, from Tarcău Nappe
Calin, M.R., Radulescu, I., Ion, A.C. et al. Investigations on chemical composition and natural radioactivity levels from salt water and peloid used in pelotherapy from the Techirghiol Lake, Romania. Environ Geochem Health 42, 513–529 (2020). https://doi.org/10.1007/s10653-019-00382-8
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