Based on ealeuliations in Apyendices ® anc [, when an object is held
in e@ hand, a rough estimate of the ratio of dose rates of beta to the basal
layer of the epidermis tc that of the garme reacing on a survey meter held
four inches away frox ar object two inches in rediur ‘outside a general
rediation field) ts 2600—§200 te 1.
(appendix I,
Thus, if thie object vere
contaminated with the same activity per unit srea that would produee a
lO=<roentger whole-dody gauma doce from general contaninetion of the area,
it would produce about 77 ar/br gamms at four inches avay at HY) nours,
and about 200645° rep:“Lour st a det: af
mga" *
Sinee the pains of
the hands have an approxinate epidersa! layer of about 40
mg/on” the beta
dose to the basal layer would be about 135-.7
(The tine of
rers/hour,
Eél was selected to sho. about the *tghest cagnituce of dose rates.)
If
one assume: that the decay ile accor fn, t: wee ther the total beta
dose to the baral larer of the @ iterz!
{> tie aext 19 boure would be
about 255=60. re; .
Whereas thw above estinates do not indicate an alarming situation, a
more serious probe: nay come when the contamination {a jut less than that
wiere @vacustion
3 indicated,
For exacpla, the cout amination e the gemeral
ares wav be five or six time: that usec as ar {llustration in the preceding
parugrezh, withoul. evacuation being recommended.
from handling objects, especially ir tin
enous’. to be a probles.
Thus, beta dose rates
soon after fallout, may be high
A sinpie and expedient procedure to reduce this
factor is frecuent washing of the mands after handiing obsects that ware ir
the fallout.
®The:e numbers agree fairly well with the computations in "Bete-contact
Hazards aseociated with Gasmaerediation Measurerents of Mixed Fission
Froduets",
Teresi, J.0., JENRDL-3<3 (CONFIDENT! ©
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