Natural radioactivity traces in South-Brazilian cereal flours by gamma-ray spectrometry

V. Scheibel; C. R. Appoloni; H. Schechter

doi:10.1007/s10967-006-0324-1

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 270: Issue 1

Natural radioactivity traces in South-Brazilian cereal flours by gamma-ray spectrometry

Authors:

V. Scheibel

V. Scheibel Department of Physics, State University of Londrina, CCE C.P.6001, 86051-990 Londrina, Brazil

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C. R. Appoloni

C. R. Appoloni Department of Physics, State University of Londrina, CCE C.P.6001, 86051-990 Londrina, Brazil

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H. Schechter

H. Schechter Department of Physics, Federal University of Rio de Janeiro RJ, Brazil

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Pages:: 163–165

Online Publication Date:: 17 Oct 2006

Publication Date:: 17 Oct 2006

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-006-0324-1

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Summary

Cereal flours are the major component of the Brazilian diet and are also important exportation products. Radioactivity concentrations of ²³² Th, ²²⁶Ra, ⁴⁰K and ¹³⁷Cs were determined in commercial samples of South-Brazilian cereal flours (soy, wheat, corn, manioc, rye and oat flour) to verify the radiological security of these foodstuffs. The measurements were carried out by gamma-ray spectrometry using a 66% relative efficiency HPGe detector. The ⁴⁰K flour activities, at 95% of confidence level were in: soy 474±3 Bq^. kg^-1; corn 30.0±0.3 Bq^. kg^-1; rye 94±1 Bq^. kg^-1; manioc 67±1 Bq^. kg^-1; oat 76±1 Bq^. kg^-1 and wheat 36.2±0.4 Bq^. kg^-1. The lower limit of detection for ⁴⁰K ranged from 0.54 to 1.43 Bq^. kg^-1. The ¹³⁷Cs activities in flour samples were: soy £0.07 Bq^. kg^-1, corn £0.01 Bq^. kg^-1, oat £0.03 Bq^. kg^-1 and in wheat, manioc and rye £0.02 Bq^. kg^-1. The highest concentrations levels of ²³² Th and ²²⁶Ra were 0.69±0.04 Bq^. kg^-1 and 0.44±0.03 Bq^. kg^-1, respectively, in soy flour.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)