Determination of alpha-emitters in Brazilian tobacco

M. Santos; A. Azeredo; D. Melo; L. Julião

doi:10.1007/bf02047966

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 182: Issue 1

Determination of alpha-emitters in Brazilian tobacco

Authors:

M. Santos

M. Santos Comissão Nacional de Energia Nuclear Instituto de Radioproteção e Dosimetria Av. Salvador Allende, s/n0, Via 9 CEP 22780-160-C. P. 37750 Rio de Janeiro (Brazil)

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A. Azeredo

A. Azeredo Comissão Nacional de Energia Nuclear Instituto de Radioproteção e Dosimetria Av. Salvador Allende, s/n0, Via 9 CEP 22780-160-C. P. 37750 Rio de Janeiro (Brazil)

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D. Melo

D. Melo Comissão Nacional de Energia Nuclear Instituto de Radioproteção e Dosimetria Av. Salvador Allende, s/n0, Via 9 CEP 22780-160-C. P. 37750 Rio de Janeiro (Brazil)

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, and

L. Julião

L. Julião Comissão Nacional de Energia Nuclear Instituto de Radioproteção e Dosimetria Av. Salvador Allende, s/n0, Via 9 CEP 22780-160-C. P. 37750 Rio de Janeiro (Brazil)

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Pages:: 57–62

Online Publication Date:: 14 Aug 2005

Publication Date:: 17 Jul 1994

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02047966

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Abstract

The decay products of uranium and thorium natural series are widely distributed in all the terrestrial crust. Their concentrations are considerable in the phosphates utilized as fertilizer in the Brazilian agriculture. In this work analysis was performed on²³⁸U,²³⁴U,²³²Th,²³⁸Th,²²⁶Ra and²¹⁰Po in 22 Brazilian tobacco samples. The results showed²³⁸U and²³⁴U are in isotopic activity equilibrium (0.5±0.2 mBq/g). The equilibrium was not reached in the case of thorium isotopes: the^228/232Th ratio was about 6.4. The average values obtained were 34.3 mBq/g for²²⁸Th and 5.4 mBq/g for²³²Th. The²²⁶Ra values were higher than its radioactive precursor,²³⁸U. This can be explained by the high affinity of radium to tobacco plant and the uranium removal during physical and chemical processes. The high concentration of²¹⁰Po (20 mBq/g) in tobacco samples may be due to radon daughter products being electrically charged and then attaching themselves to inert dusts, which then become attached to tiny hairs on tobacco leaves. The results of this work are consistent with values presented in specialized literature.

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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)