First International Conference on MOLDAVIAN RISKS – FROM ...

<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE
16-19 May 2012, Bacau, Romania
MODIFFICATION OF GAMMA SPECTROSCOPY ENERGIES
IN ENVIRONMENTAL RADIATIONS
Marius Stamate 1 , Iuliana Mihaela Lazar 2 , Gabriel Lazar 1
1 ”Vasile Alecsandri” University of Bacau, Department of Mechanical and Environmental
Engineering
2 ”Vasile Alecsandri” University of Bacau, Department of Chemical and Food Engineering
Corresponding author: Marius Stamate, mstamate@ub.ro
Abstract: Monitoring the environmental radioactivity is a very important issue, in relation
to the protection of human health. This is especially the case when there is an accidental
release of radioactivity into the environment, as was the case with the Chernobyl and
recently Fukushima accidents. Radionuclides that can be found in the environment may be
divided in three groups: naturally occurring radionuclides with very long half-life;
naturally occurring Radionuclides that have short half-lives on a geological time scale and
Radionuclides released into environment by the human activity and accidents. The gamma
ray spectroscopy is a powerful tool in order to monitor the environmental radioactivity.
Multichannel analysers have been used for monitoring the gamma radiation spectra on a
daily basis over a long time. We have recorded during a 4 years period the gamma ray
energy spectrum, and we have found that there are significantly differences between the
compositions of the spectra. We have observed that the radioactivity spectrum changes
suddenly and keep those characteristics over a long period. We have observed three such
modifications and analyse the possible causes and effects.
Keywords: gamma radionuclides, environmental radioactivity.
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