tation did not record for a sufficiently long time to determine definitively the half life of
this isotope.
Reliability
of
Residual-Radiation
Data.
i general, the residual in-
strumentation functioned either well or not at all. Tables 3.1 through 3.4 show that the
major malfunctions were due to inoperative chart drives. The possibility of malfunc2
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10
Time After Shots , Minutes
Figure 3.1 Residval exposure rate within blast shield versus time for Shot Zuni;
Station 221.05, range 68,600 feet. For unshielded rate multiply by 1.4. Total
72.9-hour exposure, 502r.
tioning of the recorders was anticipated prior to the opeation; however, lack of funds
and time torced the use of these recorders. The recorders thet worked were checked
with a Timemastcr and adjusted tu withn 40.069 pei: cnt accuracy. The repcated calibrations cf the instrument systems indicated a maximum total error of less than 10
percent.
Figures 3.1, 3.3, 3.7, 3.8, 3.9, 3.13, 3.14, 3.15, 3.16, 3.17, and 3.18 present data
taken with the detector heads inside a steel pipe which served as blast and thermal protection. The results from these Stations should be increased by a factor of about 1.4
to compensate for the shielding of the blast housings. This estimate of the shielding
28
Text continued on Page 43.