on the washed weather decks were calculated.
The dose-rate histories from the gamma-
1onization decay unit were corrected for background of external radiation and normalized to
read lr hr at H-i hour. Slopes of the log-log plot of normalized dose rates versus time were
calculated for various periods.
The various estimates of probable error in the results obtained from GITR data were based
upon consideration of the following (or combinations thereof): (1) relative accuracies of biased
detector calibrations in the field (Section B.1): (2) tolerance intervals for bias-correction factors calculated for a broad range of assumed radiation-source geometries and gamma energies
(Section B.2 and Table B.9); (3) estimated effects of timing errors (Appendix D); and (4) the
variance of data about the calculated averages, where appropriate.
The film badges were developed by TU-6, but the gross densities were read and converted
to gamma-dose values by project personnel. The gamma doses for all film-badge stations in
each compartment or area were averaged. Similarly, the doses for stations in each athwartship (transverse) third of the various compartments were also averaged. Ratios of average
dose in compartment to average dose on washed weather-deck areas were calculated. Filmbadge calibrations and estimates of error are discussed in Appendix C.
2.4.3 Data from Other Projects. For both Shots Wahoo and Umbrella, this project required:
(1) an approximate total of 1,700 standard Rad-Safe film badges which were supplied and developed by TU-6—for technical measurements; (2) records of near-surface wind velocities in the
vicinity of the target ships—for correlative purposes: (3) access to photographic and other information that helped to define the dynamic radiological phenomena as a function of time and
location in the contaminated region; (4) access to all photographs showing the locations and
orientations of the ships with respect to surface zero after shot time—for correlative purposes;
and (5) film-pack data for the weather-deck areas from Project 2.3—-to augment fiim-badge
data obtained by Project 2.1.
TABLE 2.1
Detector To pe
GITR DOSE-RATL RANGES
Recor. Durstion
Gamma Dose-Rate Rang:
hr
Stangar!
Stanwared
46
M oocurieu
-
9 mr hr to s7.u00 vr, hr
9myrhr te 17.000 br ihr
Leda t 2.00 dee pr hy
19