Activity concentrations of natural and artificial radionuclides in feline dry food
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2015
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INTERNATIONAL CONFERENCE ON ENVIRONMENTAL RADIOACTIVITY
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Natural radiation exposure is an inherent
condition to all living species, once radionuclides from
the 238U and 232Th chain can nearly be found in all
places. Information on radionuclides concentration and
exposure levels, from natural and anthropogenic sources
are absolutely necessary to investigate the possible
effects that ionizing radiation can induce. These can be
very different depending on the organism considered
and the exposure pathway. In recent decades, the
exposure of non-human species to ionizing radiation has
been specially considered and investigated (ICRP, 2014)
by a vast number of scientists and organizations, once
they differ widely from the exposure of human beings.
Brazil holds the second largest cat and dog
population in the world, consuming over 2 million tons of
feed every year. The country also stands out for its
production of pet food that produced 2.4 million of tons
of feed in 2014, representing the world’s second largest
industry. A novel study regarding the radionuclide
content in different dog and cat food is being developed
since 2013 and preliminary results have been presented
by Cavalcante, F. and Pecequilo (2014), for selected dry
dog food. The present study presents an evaluation of
the radionuclide and radioactivity content of different
brands of dry cat food, commonly found in local markets
in the city of Sao Paulo, Brazil.
Thirteen different samples were crushed into
powder and kiln dried before tightly sealed in 100 mL
HDPE flasks, with a plan screw cap and bubble spigot.
These samples, after resting for 30 days to ensure
secular equilibrium, were placed in an extended range
coaxial germanium detector (Canberra XtRa GX4020
detector) for 150 ks and the acquired spectra were
analyzed with the InterWinner 6.0 software (InterWinner,
2004). The natural radionuclides considered were 238U,
232Th and 40K, the anthropogenic radionuclides
investigated were 60Co, 131I, 137Cs and 134Cs.
The results for the considered artificial
radionuclides have shown activity concentration values
below the detector’s MDA (Minimum Detectable Activity),
as in Table 1. The concentrations of natural radionuclides
ranged from 1.12 ± 0.29 Bq/kg to 3.77 ± 0.36 Bq/kg for
226Ra; from 1.48 ± 0.40 Bq/kg to 6.27 ± 0.78 Bq/kg for
232Th and from 216.8 ± 11.2 Bq/kg to
361.7 ± 16.8 Bq/kg for 40K, as shown in Figure 1. The results suggest that the samples evaluated
have no contamination of artificial radionuclides and the
natural radionuclides concentration will not contribute to
significant absorbed dose by their ingestion. Therefore,
the authors conclude that these studied brands carry no
radiological risk for the animals ingesting them.
Como referenciar
CAVALCANTE, F.; PECEQUILO, B.R.S.; LEONARDO, L. Activity concentrations of natural and artificial radionuclides in feline dry food. In: INTERNATIONAL CONFERENCE ON ENVIRONMENTAL RADIOACTIVITY, September 21-25, 2015, Thessaloniki, Greece. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/31251. Acesso em: 26 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.