UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:21
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Conference: Bucharest University Faculty of Physics 2010 Meeting


Section: Applied Nuclear Physics


Title:
Experimental investigation of gamma ray attenuation in composite materials


Authors:
Elena Iliescu (1), Sorin Bercea (1), Beatris Neacsu (1)


Affiliation:
(1) National Institute of R&D for Physics and Nuclear Engineering-”Horia Hulubei”, Bucharest, Romania


E-mail
elenailiescu2004@yahoo.com, beatris.neacsu@gmail.com


Keywords:
gamma ray attenuation, gamma spectrometry, dose rate measurements, radionuclide transfer processes, composite materials, transmittance


Abstract:
A metal matrix composite (MMC) is composite material with at least two constituent parts, one being a metal. The other material may be a different metal or another material, such as a ceramic or inorganic compound.MMC are made by dispersing a reinforcing material into a metal matrix, the matrix is the monolithic material into which the reinforcement is embedded, and is completely continuous. This means that there is a path through the matrix to any point in the material, unlike two materials sandwiched together.Unlikeness to the conventional polymer matrix composites, MMC are resistant to fire, can operate in wider range of temperatures, do not absorb moisture, have better electrical and thermal conductivity, are resistant to radiation damage.Particles or various types of rays released by radioactive decay of elements, which may be naturally occurring, created by accelerator collisions, or created in a nuclear reactor and extracted for therapeutic or industrial use and released accidentally, or released sentential by a dirty bomb, or accidentally by nuclear accident, or released into the atmosphere, ground, or ocean incidental to the explosion of a nuclear weapon for warfare or nuclear testing.We have measured the dose rate of gamma ray passes through composite plates. The probability for absorption in thin layer is proportional to the thickness of that layer: D(x)=D0^(e-µx) (1) - D0 the dose rate of the incident narrow beam and D is the dose rate of the narrow beam coming out of the sample. We studied ionizing radiation attenuation (A) in some composite plates by different thickness and different sources of gamma radiation and calculated the experimental uncertainties. A=1-T (2) - T is the gamma ray transmittance T=D/D0 (3) The other method used is for radionuclide investigation gamma ray spectrometry by a HP(Ge) Gamma-ray Spectrometer. The results are presented.