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