channels.
The data are plottcd by a special purpose computer
located at Parry.
~
Gamma field intensity records (Fig. 6.4A1) indicate
that both ships entered the contaminating event at about H+2
hours.
Figs. 6.4A3 and 6.4A4 apply to the flight decks which
received only about 30% of the average level of contamination
for each ship.
Dosage rates on the flight decks peaked at
about 400 mr/hr (H+3¢ hours) on YAG-39 and about 8 r/hr
(H+10 hours) on the YAG-40,
The dosage accummlated at the
flight deck stations for the period to H+100 hours were 2
and 220 roentgens, respectively.
Washdown
The different amounts and times of arrival of contamination on the two ships precludes a direct washdown evaluation.
Accumulations on the unprotectedship were high enough at some
points to give lethal doses within 24 hours.
Some not completely
consistent and thus far incompletely evaluated data indicate a
washdown effectiveness of greater than 90%.
The qualitative
nature of this figure must be emphasized, as must the extreme
importance of obtaining much more conclusive data from a highly
contaminating simultaneous exposure of both ships before making
&@ quantitative evaluation of weshdown effectiveness.
Interesting
correlation tetween reletive wind and contamination may be infer-
ri
C
red from isodose rate lines.
See Fig. 6.4A9.