on
sea salt which might unadvertently nave been included at the time
of preservation.
Tne August 1953 samples including preservative,
were ev.iporated to dryness, so that the sample
from Station 7 in-
ciuaging 811% water accidentally used for washing: the plankton bucket,
' Nn
me careful work of br. Renz: cela ay | ,
appeared low in radioactivity.
.
precess:ng the plankten samples of August 195% +s gratefully acknowledged
Data after 1956 are presented as of the date of counting, rather
than being corrected back to date of collecting as was done for tha
1954-55 macerial.
It is probable that if corrections for decay could
have been applied to the 1956 data the levels on the date of collectlon would have been fourd to be about twice as nigh as those here
given for tne dite of counting,
but data from later collections would
have been practically unaltered.
Results and discussion
Tables 1 and 2 give the plankton data from 1954 to 1958, includ-
ing the v.lues from which Tatle 12 of the preceding report, UWFL-43,
was commtled.
ia
Individual plate values appear in order to show the
degree of virlaollity,
and for 1954-55 to permit comparison of coarse
and fine mesh net samples.
Fadiloacttvity is expressed per unit welght
of both wet plankton and planktcnic ash in order to assess the relative.
Suitir‘iity of tnese tvo buses of reporting results.
. leavels of radioactivity were equilly nigh in coarsenin fine
meshed nets.
basis
The equality prevails on either wet weight or ash weight
amonz the ten pairs of simultaneous tows with coarse and fine
ve
(00.
5 | DO ARCHIVE
S 4