fore ere ey
(ae!
highest magnitude of dose rates.)
If one assumes that the decay is accord-
ing to te2, then the total beta dose to the basal layer of the epidermis
of the hand in the next 10 hours would be about 320 reps.
Whereas the above estimates do not indicate an alarming situation, a
more serious problem may come when the contamination is just less than that
where evacuation is indicated.
For example, the contaminaticn of the fsenerul
area may be five or six times that used as an illustration in the preceding
paragraph, without evacuation being recommended.
Thus, beta dose rates
from handling objects, especially in times soon after fallout, may be high
enough to be a problem,
A simple and expedient procedure to reduce this
factor is frequent washing of the hands efter handling objects that were in
the fallout.
Beta lxrosuvs to the Feet and Lover hezs
It was suggesicd in Criteria II that normal closed-type footwear (es
compared to such as open sandals) would probably afford adequate protection
against significant teta doses to the feet from fallout raterial on the
ground,
There is still the added problem if the material be sovtfed up and
cling to the ankles and lower legs.
If there were no intervening clothing,
or perhaps even with thin stockings or socks, this might result in significant biological teta doses being delivered to these parts.
For exemple, if
the gamma dose rate reading at FE *¢ 3 hours were something less than five
EBANRNORIIHI SL pat
ce ee re
roentgens per hour, evacuation would not be indicated.
However, for fallout
material of the same concentration in contact with the skin the beta dose rate
at 7 mg/cm” would be about 600 reps/hour (See appendix B.).
Presumably,
personnel would be kept indoors for a few hours but upon release the
approximate beta dose rates at 7 me/eme would be 260 rep/hr three hours
later or 210 rep/hr six hours later.
In addition, there is the variable
pregam,