PRECIPITATION VS. ®’Cs IN MILK IN NORWAY
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Fig. 7—Cesium-137 in milk in the spring of 1963 us. the precipitation
in 1962,
In Norway the grass that is to be cut for hay is usually grown
during May, June, and July. Besides finding the correlation between the
yearly precipitation and the '*’Cs concentration in milk, it was of in-
terest to correlate the amount of precipitation in this period with the
137¢s concentration in the milk the next spring. Statistical analyses
Showed no such correlation in any of the three zones, However, in
zones 2 and 3 there is a statistically significant correlation between
the yearly precipitation and the concentration of '’Cs in milk the
following spring. This correlation is valid for zone 2 for all three
years and for zone 3 for precipitation in 1962 and 1963 and milk in the
springs of 1963 and 1964,,. respectively. In zone 1 no such correlation
was found.
The
coefficients of correlation are shown in Table 2, Several of
these amount to statistically significant correlations, but only those
which are consecutive (underlined in the table) were used. In Fig. 9,
with respect to zone 2, and in Fig. 10, with respect to zone 3, the
correlations between precipitation and 1370s are drawn as lines of
regression together with their curves of 95% confidence. (In every
calculation we tried equations of both first and secor. . degree, but the
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