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210Pb in forage consumed by dairy cows.

C M Silva¹, R S Amaral, J N Tabosa

¹Departamento de Energia Nuclear, DEN-UFPE, Avenida Professor Luiz Freire, 1000, Cidade Universitária, CEP-50740-540, Recife, Brazil. cleomacio@ig.com.br

Bulletin of Environmental Contamination and Toxicology

|September 22, 2009

Summary

Lead-210 (210Pb) was found in high concentrations in forage from Pernambuco, Brazil. This poses a risk to dairy cows and potentially humans through contaminated milk.

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Area of Science:

Environmental Science
Radiochemistry
Agricultural Science

Background:

Mafic rock blocks with high uranium content were identified in Pedra and Venturosa, Pernambuco.
Elevated uranium levels can lead to increased natural radioactivity in the environment.

Purpose of the Study:

To quantify lead-210 (210Pb) concentrations in forage from the affected areas.
To assess the potential risk of radionuclide ingestion by livestock and subsequent human exposure.

Main Methods:

Sampling of forage from farms in Pedra and Venturosa.
Measurement of 210Pb concentrations in dry matter samples using gamma spectrometry.

Main Results:

210Pb concentrations in forage ranged from 2 to 503 Bq kg(-1).

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The high levels indicate significant bioavailability of 210Pb in the local forage.

Conclusions:

The elevated 210Pb levels in forage present a considerable ingestion hazard for dairy cows.
Contamination of milk with 210Pb is a potential risk to the human population in the region.