NDLI: Environmental gamma radiation in municipalities of Eastern of São Paulo State, Brazil

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Environmental gamma radiation in municipalities of Eastern of São Paulo State, Brazil

Content Provider	Semantic Scholar
Author	Bastos, Rodrigo O. Pascholati, Elisabete Maria
Copyright Year	2005
Abstract	Aerial gamma spectrometric data have been processed aiming to estimate outdoor gamma radiation dose for an area of about 11,500 Km 2 , located in the eastern portion of Sao Paulo State, Brazil. The study comprises the Campinas city and surrounding areas, including over fifty other municipalities with a total population of about 3.5 million people. The reliability of these processed data have been evaluated by comparing the dose estimates obtained from the aerial gamma spectrometric data for the Itu Intrusive Suite with available estimates yielded from ground surveys. Between the estimates, this assessment showed a difference of about 27%, probably due to radioelements losses during pedogenesis and attenuation due to soil moisture and vegetation cover. The municipalities situated over sedimentary rocks of Parana Basin presented lower averages while the highest ones were found in municipalities where part of the area covers granite intrusive suites. Average radiation dose per municipality have been compiled for the fifty municipalities approached in this research. Averages varied from 39 nGy.h -1 in Engenheiro Coelho to 109 nGy.h -1 , in Votorantim. Median values were estimated for Campinas, Itu and Paulinia (68 nGy.h -1 , 65 nGy.h -1 e 60 nGy.h -1 , respectively). The major contributor to the absorbed dose in all municipalities was the 232 Th series. The population-weighted average radiation dose yielded for the fifty municipalities was found to be 64 nGy.h -1 , which is slightly higher than the world's average (57 nGy. h -1 ). The estimated radiation doses presented in this study are similar to published data for areas comprising analogous rocks and likewise, these gamma-ray dose levels show no indication of health hazards for human being.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ige.unicamp.br/terrae/V1/PDF-N1/terrae_2005_v02n01-02_p37-45_bastos.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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