wero
a
ere
4
Meath
ait itor
ak
sat
A AVAL
bine seetwraith
.
cece ee
-je
during the treatment.
The personnel
go
through an installation
for neasuring ingested gamma radiation before and about 2% hours
after each experiment during which the radlo-lodine is sprayed, no
activity of the thyroid gland has bean detected in these persons.
Sampi ing
Grass:
Hand-mowing or use of a motorized cutter, sccording
to the type of experiment and the surface to be sampled, with
removal of a surface greater than or equal to 1 a’,
Milk:
Milking twice daily (8 and 18 hrs), which is present
practice on the farm.
Treatment and Measurement of the Samples
Grass:
The harvest is weighed, then an aliquot is oven dried
to determine the quantity of dry grass material per unit of
surface,
We introduce 500 g of fresh material into a hermetic
flask (3 2), special for gamma spectrometry, and add 10 al of
formaldehyde to stop any fermentation,
Milk:
Production from each milking is measured; we take 3
i
liters, to which we add 10 ml of formaldehyde as preserving
&gent.
Measurement by sulitichannel gamma spectrometry is
done as soon as possible, for the reasons given above.
Results
|
|
Contamination of the Grass
Direct retention: the measurement of I/°) in the air saapled
part (mowed or cut) has let us calculate the percentage of the
atomized 1251 directly retained in this part of the plant. The
results obtained are showm in Table I.
oe
.