SECTION W
DECONTAMINATION OF MOTOR VEHICLES
Baeckgr ound
The principal purposes for decontaminating motor vehicles are to
and to reduce the external gamma exposure.
All of the uncertainties in-
herent in personnel monitoring are applicable here plus additional ones,
such as estimates of the probability of contact and the amount of transfer of radioactive material from the vehicle to the skin.
The following
criteria for monitoring motor vehicles (Graph IV) were previously developed, and until the new beta measuring instruments (see SectionIII)
are calibrated, will continue to be recommended.
One method of avoiding or significantly reducing vehicle contamicetion is to prevent their being in an area during the time of actual
Taliosz.
It is vessitle that fallout across a highway may be higher than
that rermitted for toruiated areas.
When such a condition is predicted,
it wold be advisable tc> hold vehicular traffic until after the fallout
kad essentially csasea,
Past experience has shown that very significantly
sess yenitle contaninaticn occurs when it passes through an area afterWard: cimjpaved To being nmteseni duoing the Pallovet time. albbouch aocvea4
TE 22.2. secili be picked up
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reduce the potential beta doses to the skin by contact with the vehicle,
on the tires and wader the fenders.
precise value itnat may be given, but it is
recommended that if the amount of fallout acrogs a main hiahway ts predicted
to te in an amount equivalent to 10 roentgens or greater infinity dose,