Z
activity has decreased significantly.
A given dose rate reading inside « vehicle may represent less contamin-
ation per unit area due to the oontritution of gama radiation from the
exterior of the vwebicle,
would more
On the other hand, eontamination within a vehicle
probably be picked up by persoaone)l than if it were on the outside.
Further, it is recognized that significently high concentrations of radio-~
active fallout may accutulate im such parts as the air filters of an
automobile.
again, this has to be weignted against the probability that
they will be handled before the activity bas decreased to low levels plus
~~
the fact that it fe relatively 4ifficult to monitor such parts on a mass
besis.
The uncertainties present in estirating possiblehasards fron vehicle
eontazination would not Justify fine distinctions in monitoring the various
parts.
A thorough cleaning, inside ant otetde, would appear to be the
best solution.
One of the obvious ways to «vold mech of the problem discussed in
Policy IV 4s to prevent vehicles entering an area during the tine of fallout.
This will not prevent the first venicles ;assing through froa pleking up
activity on the tires from the nighway.
‘t {a belleved, however, this will
not constitute sueb a troublesoms protler and pest experience has indicated
that the activity foun¢ on the tires noticeably decreased after several cars
hed pessed over the highway.
Further, if vehicles are not present in the
fallorwt {t will nelp reduce oontarinatior of the passengers and of the
insides of the wehicles,
TIEN.
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