-2~
On the whole, the Livermore values are higher than
Berkeley*s. The reason for thia is not established,
but other information (not in this report) suggests
the possibility that greater area ventilation at
Berkeley may be related, particularly in the windy
months of June, July, and August.
2)
Compared with previous years, an increase in aver-
aged fallout concentrations was observed.
(An
estimated six fold in the last 7 years; is fold
since last year.)
A decrease in activity was noted as Hardtack I,
progressed to a low in July and August.
(A similar
decrease was observed during June, July, and August
of the previous three years.)
Hardtack I was preceded and followed by a period
of activity 4-10 times greater.
(Closely before,
in time, to these peaks were two series of publiclyreported Soviet experiments. Causality is not
rigidly demonstrated, but it is interesting to
note this same picture also appeared in the 1957
and 1956 record.)
Following the 1958 rise in
mid-October, 1t was observed that during Hardtack <.
II one fallout incident occurred which appeared
clearly to be of continental origin.
5)
Rainfall is not sufficiently frequent in the LRL: ...
area to reflect fallout trends during the spring
sumner, and fall.
Quantities of fallout material
transiting the area concomitant with rain will
bring substantial quantities to ground collectors.
During Hardtack, 30 fold variations in radio-
active rainfall (expressed as mc/miS) were observed; such could not be related to air dusts
sampled near ground level.
6)
Based on sparse data, horizontal fallout trays and
vertical cloth screens evaluated by radioautograph
and/or counting techniques showed parallel trends
to filter paper counting data.
7)
No correlation was found between fallout variations
in air or rainwater and gamma values 3 feet above
ground. In fact the gamma values did not vary
Significantly over many months.
8)
During the reporting period no correlation was
- apparent between tap-water and either rainfall
agtivity or air dusts.
(Prior to this veriod a
heavy raiaocut was followed by a sharp increase
in tap-water activity. )}
2