ALTE.
Lt
in Table 1).
O. PaakKoua, R. NASANEN, D. Merten and J. K. Miettinen, Strontium 90
11
in the autumn (Nos. 12 and 13) but the difference is probably not significant.
The sameis true regarding the difference between the spring (= May and
J]
He HE He HEHEHE He HE HE HE HE
June) values of the factories »A» (Nos. 10 and 11) and »B» (Nos, 14 and 15).
e ™Sr/g Ca
; obtamed,
It is of interest to note that a milk powder sample from Somero (factory B)
taken in Sept. 1957 and analysed by the method of Bryante¢ al. (15) by one
of us (D.M.), gave 7.0 wuc Sr/g of Ca.
The Sr content of the milk samples from the experimental farms varies
from 3.6 to 11.6, the mean being 5.7 zuc Sr/g Ca. This is significantly lower
than the corresponding »country-wide» value for Southeast Finland, 8.0 uue
%S8r/g Ca (No. 12, August 15). This may be partly due, for instance, to the
fact that the productivity of the pastures of the experimental farms is considerably better than the average. The higher value of sample 9, 11.6 yuyc
%Sr/¢ Ca, may correspondingly be due to the very poor soil and low productivity of the natural wet lake-coast pasture in question. This value is
significantly higher than the other value from Lapland (No. 1), 3.7 gue
9Sr/¢ Ca, but not much higher than the corresponding »wide-area» value
for Southeast Finland, 8.0 nuc Sr/g Ca.
Milk produced in farms with poor pastures in South Finland would probably show similar activities, because the average (8.0 wuc Sr/g Ca) is
much higher than the mean of »good» (= experimental) farms, 5.7 suc
“WSr/g Ca, (Nos. 1—8).
jes reported
yin Tables
ae activity
»A» (Nas, -
ples taken
The Sr content of the grass sample No. 9 (Table 3) is also about twice
as high as the mean ofall farms. Otherwise it is not possible on the basis
of the present study to say with certainty whether the relatively small
differences between the individual farms are due to the difference in rainfall
or in soil conditions or to other factors.
The average value for the milk of South Finland in summer 1959, 8.7
upe °Sr/g Ca, is of the same order as values for Great Britain in 1959, 9.35
ue “Sr/g Ca, (7), for Sweden in December 1957, 7.8 wuc Sr/g Ca, (16), for
Germanyin April to December 1959, 8.6 wuc Sr/g Ca, (19). It is slightly
lower than the mean value for Norway in 1958, 11.4 puc Sr/e Ca, but
significantly lower than the corresponding Norwegian value for the first
months of 1959, 17.4 ue Sr/g Ca (11), and the Canadian values for summer
1959, ca. 20 puc Sr/g Ca (20).
Since the 1959 values for the other countries are evidently also higher
than the 1958 values quoted above and since our values, reported in this
paper, are representative of summer conditions, when the Sr content of
milk reaches the annual maximum (9, 11), it can be concluded that the
%Sr content of milk in South Finland is slightly lower than in the other
countries in Northern and Western Europe. The value obtained in the
present study for the discrimination factor grass-milk, 0.048, is significantly
lower than that quoted in the UN Report (1), 0.16, or reported by