Appendix D
ANALYTICAL DATA from SAMPLES of SEAWATER
Duplicate samples of sea water were furnished by the
NRDL and the SIO. At the HASL, each sample was filtered and th> remainder evaporated.
The beta activities
lated value of 4.43 « 10° (dis /min)/liter for 1 mr/hr
gamma at 3 fect.
However, the results do indicate that
the general magnitude of this assun.ption is correct
for both particulate and salt fractions were determined
by counting. These data were corrected for radioactive
decayon the basis of the decay curves in Reference 7.
D.2 DEPTH SAMPLES
Particulate salt separation and beta analysis were
performed on a group of depth s»mples supplied by
D.t SURFACE SAMPLES
Project 2.62 (SIO).
The beta analysis, corrected to H+ 24 hours, is summarized in Tables D.1, D.2, D.3, and D.4, for Shots
Zuni, Flathead, Navajo, and Tewa.
The sampling loca-
tions were plotted on the aerial-survey isodose charts
and the gamma intensity at each station was estimated
by extrapolation between the isodose contours.
Because
the gamma dose-rate values are estimated, further ex-
trapolation may contain errors. The time of gamma
survey and the time of sampling do not necessarily coin-
The court titne corrections for
radioactive decay were made to the mean of the counting
period for all samples within a group. The data from
Shots Flathead and Navajo are summarized in Table
D.5, and from Shot Tewa in Table D.6.
These values are plotted in Figures D.2 and D.3.
Activities below 10 dis/min are not particularly valid,
because they correspond to counting rates below the
cide, so the interviewing horizontal translation of the
statistically reliable level. The surface activity for
samples from Shots Flathead and Tewa are based on
the average of several identical samples. The surface
water mass can introduce displacement errors.
activity for Station N-17, after Shot Navajo, is based on
The surface activity, as beta disintegration per minute per liter, has been plotted against estimated gamma
dose rate in Figure D.1. With the large variation of the
observed cata, it is not possible to confirm the calcu-
a single sample and maynot represent the actual surface
conditions. A mixing depth of 60 meters is indicated by
this data (Figure 3.26).
Tages “10 Yeuld Deleted ’
69