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the Ve Stthator ian ty the asler crews Goorters cuuid have owen daw te: iesaupe past aoor
weals, leakage from Venulitur tranzs, or air sample extacst. Veniilator troaks were normally
under negative pressure dur to induced Now, and leakage from these trents could only Late et~
curredif pressures ware raised by wind ov quse carpe yoseage. ‘The source of these activity |
collections cainot te determined.
3.2 EXTERNAL RARATION
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3.2.2 Estimates of Fetern?! R22inties Doses See ts the Leress of Cotaaitimnta, Tased on
_ GITR Pata AN BD-£39 Grrdose rates were torreeted fur deezy Wecay-faciers used are
given in Apmerdis B) to r/hr at +50 seconds. ations 2 axd 3were used forcxtericr aose
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rates, because these stations are in the same sccion of the chip as the ingress lest compart-
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se tany
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ments. However these deteetozs were saturated prier te R«S3 seconds. The synthe ized
average weather deck cose rates were used for Gis period.
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The duse rate duta for Stayons 2 and Jand for Stations 6 asd 7 were average’ to represent
.
doscrates for shipcentertine locativas in their respective area.or compartment. Detaycorrected duse rates for the average of Stations 2 and 3 and the average cf Statiens 6 and 7 are _ Shown in Figures 3.19 2nd 3.20. Figure 3.21 shows a of the soningress compartment decay -_
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correrted dose rates uormalized to the average of Stations 2 and 3 at 360 secords. This tame
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was selected for normalization,, beesuse it is the tims of macimeam cese rates during the gece
ond envelosment at nearly zt of the stations on the ship. Fiyure 3.2) chews on a cemperative ©
* basis these dose rates that arg availiable for use ia the norastizing technique described in —
.
Section 1.3.1 for cstimaiing case rates due fo Fngress.
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Numereue attenmmis af using. this tech-
nique Cemoastrat x that Ge period prior io 11459 or 83 secouis was the most sensitive in aout
- determinations, and in Figure 3.2) it will be noted tin¢ the areragos Ser Stations 2 az’ 3 and
Stations G and-7 represent the extreme range of maaingerssse ruies during this gerico. sin
previously ivdicated for Station 18, the lower flovel ef the forward orsine reom, the plesence: *
of a locd radiati-n source is apparent stauriing 2% $402 eccon’s asd eliunisctes (Gis tation fer
+ use ia the normetizalion trckrique.
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The averanes cor Siaticas 2 and 3 avd Stations 6 aid 7 were noriaalized to thr totst Ingrecs-
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compartment data, as expained Eciow, to siwilcte the deczy-corrected dose rates, wich
would fave been observed had there been no inoress of eatamimats into the shin. Figrres
3.22 through 3.29 show such noningress curves ai aise the ttak doway-rcrrected dase rztes
in various compartments,
The successive stexs mm determining the norrasiization facicr asszme Yat the deear-
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correcied ingress dose rates, -i.¢., the Glfierenve between tic fetal ceeas-corrected dose rate:
arf the normalized decay-cor: ected noningress dose rate In the compartovent, were the same -
at 360 seconds and 520 seconds when the averapes cf Stations 2 and 3 were used 2% normalized
decdy-cerrected tuningress dose rates, and thot Getay-correcied ingress dose rates were the
same at 360 and 560 seconts when the averazes of Stations 6 aad 7 were used as normalized
.
decay-corfected aoningress dose rates. Normalization factors delermined by successive
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‘approrimatiors to rocet these assumptions are piven in Tabie 3.4. Average decay-cerrected
.
dase rates for Stations 2 aed 3 and 6 and ¢ were multiplied by the approprizte normalization
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factor to obtain nvemalized decay-corrected dose rates, hick, when sublractedfromthe ol‘served ingress-compairtment data, leave remaiaders Orat are the derived estimates of decay-
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corrected dose rates due to ingress.
Asis evident fram Figure 3.23, the use of Stations 2 and 3 aud 6 and 7 for these normalizations should result in the widest range ef decay-corrected ingress dose rate estimates to be
derwwed from the .vailalic data. Curves of these two oets of estimated decuy-corrected imress
dose rates are presented in Figures 3.30 through 3.37. Note tat numerous instances of nepative dorr rates are found. This result must be accepted as one of the inaccuracics in using the |
55.
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_CONFIDENTIAL,
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