UNIVERSITY OF WASHINGTOW
APPLIED FISHERIES LABORATORY
FISHERIES CENTER
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SEATTLE 5, WASHINGTON
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January 3, 1957
Dr. Allyn H. Seymour
Marine Biologist, Biology Branch
Division of Biology and Medicine
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U.S. Atomic Energy Commission
1901 Constitution Avenue N.W.
Washington 25, D.C.
Dear Dr. Seymour:
In response to your letter of December 27, 1956:
It was intended to include data on the fish. A copy of the
draft of the table is enclosed. The results of analysis with
the gamma spectrometer will also be included; you may recall see-
ing the rough draft of the figure which includes flying fish
liver. A copy of this figure is also enclosed.
. The plankton-surface water ratios as we have calculated them
are as follows:
1.
Average of ratios of plankton activity:surface water
(filtrate plus filter activities) is 2000:1.
The mini-
mum ratio is 23:1 and the maximum is 15000:1.
median is 790:1.
2.
The
The ratio of the average plankton aoe Bone surface
water (filtrate plus filter activity) is
823:1.
The filtrate plus filter activities are used for the water
values to make possible direct comparison with the Troll and
WALTON ratios. The ratio of the average plankton activity:surface
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water filtrate activity for the MARSH samples is 1220:1.
This
might actually be a more realistic ratio in that one is presumably
comparing only the activity in solution with that in the plankton.
Variability is so great, however, that for purposes of generalized
approximation a ratio of 1000:1 seems reasonable and we have so
stated in the rough draft of the MARSH report.
This would only be
true, of course, at a time following fallout contamination compa-
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rable to the time of the MARSH survey following the 1956 test
series.
The value "300" for the plankton:'water activity in the Troll
report which you had wondered about is given in the text on page 8,
paragraph 3 ". . . zooplankton activity appears to be 300 times the
activity of sea water per unit weight .. ."
Your copy of the MARSH data, which you took with you to Washington may have an incorrect value for the plankton activity at station
28. This should be 108, not 1082.
-: LRDeeb
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Card R. 1
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