CHAPTER 17
Table 17-8.
Compartments in which it is estimated that radiation fields
were caused by ingress of radioactive contaminants.
Compartment
Ship
Shot
DD 592
Umbrella
Forward Engineroom
€
reroom
DD 402
&7a
Dp
pp 592
—Umbrelia
After Enginerodon
DD 3Ye
Umbrella
Ventilation air
After Crew's Quarters
DD 592
Umbrella
Ventilation air
Galley
Forward Fireroom
All Three
Umbrelie
re
Probable Ingress Path
Ventilation air
Boiler air (firea
ondenser
water (7?
n
Bollerair lunfired
o
The film-badge doses in the forward fireroom varied with location,
the highest doses being at stations closest to the blower room of the
operating boiler.
The following average dose values,
summarized from
a table in Ref. 6, indicate for Shot Umbrella the portion of the total
gamma dose estimated to have been due to ingress at various locations
aboard DD 592.
"Film badge doses are 24-hr doses; GITR doses vary from
epproximately 1 to 2 hr doses.
The ingress dose estimates are round
figures, adequate to represent these estimates for 1 to 24 hr.
The
uncertainties inherent in the basic data and in the assumptions and
approximations used in the estimating techniques have resulted in a
wide range of values for the ingress dose estimates at each location"®©
It should be noted that “between 17 and 50 minutes after Shot Wahoo
(after passage of the base surge), the dose rates in the fireroom of
DD 593 were on the order of ten times higher than on the washed weather
decks, and about 100 times higher than the dose rates in the adjacent
engineroom. The fireroom dose rates....appear conclusively to be due
to deposited radioactive material in the boiler or boiler-air system.
The dose for this period, approximately 35 mimutes, was 5 r. The dose
for eli other compartments in the ship for the same period was less than
OO
lr."
17-109