and I instruments. Pot readings were taken concurrently and were used to fill the gaps
in the Mark I, I, and UI measurements.
At three stations, 1, 2, and 6 (Figure 2.6), vertical casts were made electronically
by lowering the Mark If instrument to a depth of 250 feet and recording its readings as
a function of depth. In two instances, this instrument passed through the contaminated
layers and into the uncontaminated water beneath, thereby giving the extent of the mixing
directly. A trial showed the need for a 150-pound weight attached to the Mark II to keep
tor pope
T
eee
NOTES
SOLID LINES- Mork tl calibration ogoinst distont
point source of Radium ot Site
Elmer, IO MAY 1954
The ray in-
adence was normal to the
poo.
instrumentS axis (Block letters
ind:cote the instruments amgiificat
I
jon ranges)
30!
DASHED LINE- Mork 11 calibration against point
oe
source of Radium of U.S.N.B.S
several weeks icter The ray incidence here agcin wos norma! to
the instrument's axis Descrepancy
between A ond the dashed curve
may be due to the battery voitoge
MR, HOUR
change or to the error in source
evaluation, note, however, thot if ts
small
tor
+ -
Points within Large Circle- Computed overall sensitivity of Mork ti when used submerged in water which is contonr
inated with the follout products
+ ——#-
whose spectrum is thot assumed
for the computation. This sensitnity
was computed for use only of the
instrument's scote-point of 19 microames
For the purposes of this final report,in situ mten‘sities were therefore derived by
Multiplying the intensities given
by the solid curves by the factor
15 (See Appendix B)
en]
—_—
°
”
20
30
‘0
MICROAMPERES
Figure 2.3 Mark II Calibrations.
the hydro wire more nearly vertical. Depths were read on the meter wheel of the hydro
wire. Unfortunately, the electrical wire was not long enough to follow the descent of
activity to its ultimate depth.
2.2 WATER SAMPLING
Water samples weretaken fromboth the surface and vertical casts in the survey after
Shot 5. Only surface samples were taken after Shot 6. All samples were air-shipped to
NRDL for analysis as quickly as possible after they were taken.
For Shot 6, duplicate
samples were taken everywhere; analyses were carried out both at NRDL and at NYOO,
AEC.
2.2.1 Sampling Devices.
Surface-water samples were taken from a bucket passed
over the side while the ship was underway; either a plastic or glyptol lining was used in
the bucket.
Two kinds of sampling devices were used to take the water samplesin the hydrographic
casts. Standard new Nansenbottles were used at a minimum of four depths simultaneously.
21