Or
avalalle HOMINETEeSS Guts ior this ¢Siimaling teclenge.
SR lamer
Negatite talees cannot bo elinunited
without imposing a severe bias for which there is po rationale in the sclection of 2 nerroaliza-
ties factor.
As cxpected, the bert agreement tetween the twa sets of esti tated dose sates aud he lewent
Decay-corrected iugress Gove rates are alk relatively conctant by H+! hour, the end ol mcat
. Of the available cata. Al ibis time, il 1% assumed that these dose rates are principally dse fo
activity deposited a8 the result af ingrese. Lacking any data, it ous aseumed eh
that thin activi
between Miv@and
was depositedprior to H+ 60 secotis and that ie bulldup occurred Getsccn
i lt
.
%.€?
‘geconds. The dotfed lines in Figures 3.33 through 3.37 represent approximations of the decny~
corrected dose rates due to depusiied aciivity baged on the above assumptiens. Single values
were obtzined for the machinery spaces; lt ia the galley, the upper dotied line was dcrived _
‘from ‘ueress duse rates bused on the normalizatiun for Stations 6 and 7 and the lower curve
fiom ingress dese rates’ based an the narmabization for Blalivns 2 amd3, The appestite os true
for the crews quarters. .
;
:
Decay-correcied dose rate curves provide little acdiiional information on the times of hegia” ning and end of ingress or envelopments. They appear to confirn: the initial tine as being
between 8+ 28 and +39 seconds, ait that the highest concemralions of ariivity were csscciated
with the Lase surge (rom. All curves break 2% about H+ 60 seconds, and at this time the influeare
of loca) radiation squrees are apparent. Ingress decay-corrected cose rates ai] rei a 1 sia
mum 22 H+ 280 seconds prier to the ser »+4 extcleproent and, 3% assumed by Project 2.3, this -.
entrelonracnt appears to have ented not b-ter Uran 8 < 660 seconds. At about H+ 1,209 seconcs,
an interse raziciien eource wes eff thesturboord bewor beam, presemablywaterbors.e 722
perhers a patch of fears aS discussed in Rsrence 22," mud contributed wost heavily to dose
s rales in tee Starbouid sice cf the ercos mess, siivbeerc weather Ceck, and the wemker deck
oa. Alllough all «ef these reahs are sct shown, ihe pres deray -corrected Joes raie
qual (9 abe nucurinmw vecay-carmcted dase rate
ate ri thege sitions dui ing (>2 second
at
Chl Clore,
*
The dtay-correcic’ Case ratesestimsted to Er dust to the ideress of centaraiy:35 (uoth total sud dac orly to daces#ed activiky, Figures 3.46 througit 3.07) were divided by ine @eay
factors given io éogendix B (o chiain esiiztes of the dose rates due to ingress. - These dise
rate cuiLastes Uincluding negative values? were numerically ileecated to give dost estimates
which are presered in Tabie 2.5. Regardiess of the uncertainties aud the wide range of these
_ estimates, it fc to be ncied that a Jarge portion of each dose was accumulated prior to the fec“ ond envelopment.- Some of the differences between (he dose estimates at each location may be
due to radiatioa from adjacent ingress spices, Stations G ant 7 were remote from ali ingress
sources, whereas Stations 2 and 3 were abewe the after firercomi and near the after uptake ~
Space. However, this ratierstization carrot oe applicd to the dose estimates for the crews
. quarters, because (iis compartmen, we s or< near any.of the other ingress test compartinents..
3.2.2 Estimates of External Gaum Radiztion Dose Due to Airborne Activity and Airborne
Activity¢Concentrations Within Test Corpartments, Bused on Air Simaly Duta The estimates
obGITR-hased decay-corrected dese rates due to (he ingress of contaminants are teo indeterminate te be used to apportion the alr sample culiections as a function of time. Therefore, it
was assunied that: (1) at H+ 30 seconds, there was an instantancous influx and diliusion at airberne artivity, which was uniformly distributed throughout the test space; and (2) airborce
activity cuncentrations due te ingress were reduced therealier only by the vlfects of dilution
by vertdacon air and radioactive decay, neglecting all subsequent ingrcss.
A deterroviation of the number of fissiors for cach total air sample was made at NRDL after
completion of the field work, because the total air samples were the only ones whese activity
at this late time was high ¢rouch fer coscting purposes. To determine the number of {issions
Per sample, a Project 2.3 sample, AOC 342 FUm iRefcrence 20}, was used as the reference
87
CONFIDENTIAL
wn
ee
Seee cae
r
“>
teaS ealtie
2
A ens
we bitAAaaaReninf
kBedegytite
peyalive values ane found in the best chiekied compdrtments —~ the lower level af the machinery-