cc
-
area will be about equal;
J
and when the wheels are teing monitored Ms to Vu
of &@ gama dose rate reading will represent equivalent contamination. diprav..g in *
gam nm
conthbution from fae bidy ot fre
Con faminatal vthith ).
Another factor to be eonzidered is that the provability of collecting
fallout material on the body from @ generally oo tanirated area in which
one lives is greater than from one's automobile.
On tie ether hand, it has
teen noted in the past that aignificantly higuer amounts of contanination
have teen found on the tires and under parts of fenders than on the remainder
of the car.
(Undoubtedly, tiie is a simple phenomenon of picking up the
activity froa the higiway.)
If one were to change a heavily contaminated
tire, siguificact amounts of radioactive mterial mip'it accumulate on the
hands, and later be transferred to the hair or eyes ty a simple ruting of
the hands over those parts,
A comperiso:. mig-t te made here :etween recomended maximm dose rates
found on perso..nel and the esta:lishing of levels of activity for automot iles,
there is one o vious difference, however;
in the first cases
t.e paterial is already on the person while in the second case one has to
introduce tie factor of probability of transfer ¢f contamination (and to
wiat degree) from the car to the Lody.
The dose rates (measurod as stated) in tale IV would represent aout
a ee
pty
equal contanination per unit area for a car as for an infinite plane if the
car were rather uniformly ocontaniszated.
If the activity were confined say
principally to the tires and under parts of tne ferers, the dose rate readings
might represent nearly twice the depree of contamination.
One must weigh
this condition wit: the pro'a ility t.at a tire will te c.asced tefore the
s