—_—~
Based on calculations in Appendices ® and D, when am object fe held
in a band, a rough estizate of the ratic of dose rates of beta to the besal
layer ef the epidermis to that of the gamma reading on a survey meter held
four inches avay from en object tvo inches in radius {outside a generel
rediation field) 10 2600-5200 to 1.
(Appencix I)
Thus, if this object were
@ontaminated with the sae activity per ait ares tint would produce a
LO~rcoentgen whole-body gacma dose from general contemination of the area,
it would produce about 77 ar/hr gamma at focr inches avay at H/) hours,
and about 200-490 reps/bour at a desth of 7 ng/en*,*
Since the pelus of
the hands have an approxinate epidersal layer of about 40 re/ex* the beta
[
dose to the basal layer would be about 135-270 reps“’hour,
(The tine of
BA) was selected to shov about the highest magnitude of dose rates.)
one assumes that tie decay is sccording to t_ 1.2
If
then the totel beta
dose to the basal cayer of the epidermis io the nex. 1) houra would be
\ )
about 250-500 reps.
Whereas the above estizates dco not tniicate an alarming situation, a
more serious probler may come when the oontazination fs jut less than that
where evacustion is indicated,
For example, the contamination of the general
area may be five or six tines that used as a1 (llustration in the preceding
paragraph, without evacuation being recommen‘e:.
Thus, beta dose rates
from handling objects, especially in times 5.0 after fallout, may be high
emough to be a protlea.
é simple ané ax e(‘mt procedire to reduce this
factor is frequent washing of the hands afte: hanitling objecte that ware in
a
the fallout,
1
*Toese numbers apree fairly well with the eutntaticns in "Beta-contact
Hazards Associated wit: Gancsaeradiation +#@e cre unts of bhixed Fission
Froducts",
Teresi, «7
OND ae BRR
Saad
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