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176 Nuclear Science and Technology | Progress Report
for individual laboratory analyses, food with
similar nutritional composition are grouped
together, resulting in 19 food groups. The
nineteen resulting food groups are as follows:
Beans; Beverages; Cakes and biscuits; Cattle
meat; Cereals; Dairy products; Eggs; Fish;
Flours, pasta and bread; Fruits; Industrialized
meat and offal; Nuts and seeds; Oils and fats;
Pizza, snacks, sandwiches, soups, sauces, and
mixtures; Pork; Poultry; Salt; Sweets; Vegeta- feature of these methods is the pre-concen-
bles. All food samples were acquired in food
stores of São Paulo city. The concentration
and the dietary intakes of As, Cd, Ca, Co, Cr,
Fe, K, Na, Se and Zn in the 19 food groups
from the Food List of the 2nd Brazilian TDS
were evaluated. This TDS showed that the
São Paulo diet was adequate for Cr, Mg, Mn,
Se and Zn and deficient for Ca and K. The Cu,
Fe, Mg and Mn dietary intakes were higher
than the recommended daily intake values
and the Na daily intake was higher than the
tolerable limit value, confirming the results
obtained by the other Brazilian diet studies. Na and V in Brazilian Red Wine by
Determination of U, U, U,
235
234
238
230
232
228 Th, Th, Th, Ra, Ra and
228
226
210 Pb levels and other elements in
rural and urban diets from a high
natural radiation region of Brazil
The presence of radioactivity has been detect- such as polyphenolic compounds. Studies
ed in food and water in several parts of the
world. The natural radionuclide concentra-
tions vary according to several factors, such
as local geology, climate and agricultural
practices. The degree of damage to human
health depends on the type of radionuclide
and the period of time that people are exposed
to it. It is known that food and water con-
tain radioactive elements, which contribute
to an effective internal dose after ingestion.
Natural radionuclides from the uranium and
thorium series occur widely distributed in the
earth’s crust. The radioactivity measurement
Instituto de Pesquisas Energéticas e Nucleares
in food and the environment is extremely
important to monitor the radiation levels to
which man can be directly or indirectly ex-
posed. Some foods have the ability to retain
radionuclides, such as natural radioisotopes
and other contaminants. The determination
of low concentrations of these elements in
food samples is time consuming and requires
tedious chemical procedures. An essential
tration and purification of the radionuclides
of interest. This is important to isolate them
from the large amounts of inactive substances
present in the sample and also to separate
them from radioisotopes that may interfere
in these determinations. In this TDS, the ac-
tivity concentrations of the radionuclides of
U and Th series are being determined in rural
and urban food from Poços de Caldas Plateau,
region that present high natural radiation.
Determination of Cl, K, Mg, Mn,
Neutron Activation Analysis
Wine contains over 600 different substances
known and its moderate consumption has
health benefits in the prevention of numerous
diseases and longer life expectancy, related
in particular to the intake of antioxidants
have shown that its inorganic composition
depends on various factors which are spe-
cific for each production area such as grape
variety, the potential of the grapes to absorb
soil substances, climatic conditions, vine-
yard soil, vinification practices and storage
conditions. The wine inorganic composition
can originate from external factors, such as
environmental pollution and absorption of
the elements in vineyard soil during grape
growth (geonenic); or from the application of
fertilizers, pesticides and fungicides to pro-
tect the plants. The inorganic components in