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These experiments are also aimed at furnishing information on the influence
f such factors as:
height and nature of the pasture, season during which con-
Ftamination occurs, meteorological conditions (especially rain),
F II,
Experimental Conditions
For the tests done in 1962, we have used a permanent pasture for 3 cows,
the pasture divided into 6 sections of about 20 acres each, according to the
so-called "rotating" method.
This procedural method, standard in developing
agricultural operations, has had the consequence that the height of the pas-
turage at the time of contamination was different for each of the sections.
In 1963 our tests were made in a “temporary” type meadow of mixed flora.
For the first experiment, we placed each of the cows in an individual pen and
fed it daily a knowm ration of contaminated grass.
In the second experiment,
the cows pastured freely in an uncontanimated meadow, but each day we gave
them a small, known quantity of fresh, highly contaminated grass,
The cattle used are of the type common In Campine; we have selected our
different cows according to their milk production so aa to obtain maximus individual differences.
The radio-iodine used was elementary 1251, carrier-free in CH3CH,OH
Solution (for certain experiments, the solution also contained 3.4% ¢Cl,),
This mother solution is then diluted with dewineralized water (1:1000)
|
before being atoaized.
Meteorological conditions:
daily record (temperatures in the sun and
in shade, relative husidity, and rainfall) is kept.
Conduction of the Experiaents
Contasinat ion
The radioactive solution fa sprayed by means of a hand sprayer
equipped with a row of four beaks, mounted on @ sled which ls pulled
:
by a jeep.
Personnel wear anti-gas masks, rubber gloves and boots
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